McNEIL-PPC, INC. v. L. Perrigo Co.

207 F. Supp. 2d 356, 63 U.S.P.Q. 2d (BNA) 1493, 2002 U.S. Dist. LEXIS 11214, 2002 WL 1377732

• Court: District Court, E.D. Pennsylvania
• Decided: June 25, 2002
• Docket: CIV.A. 01-1100
• Status: Published

Opinion

OPINION AND ORDER

SCHILLER, District Judge.

This is .a patent infringement action. Plaintiff McNeil-PPC, Inc. (“McNeil”) alleges Defendants L. Perrigo Company and Perrigo Company (collectively “Perrigo”) infringe four McNeil patents covering a popular version of the Imodium ® Advanced antidiarrheal. In a Memorandum and Order issued April 8, 2002,1 construed certain disputed claim terms pursuant to Markman v. Westview Instruments, Inc., 517 U.S. 370, 116 S.Ct. 1384, 134 L.Ed.2d 577 (1996). Beginning April 22, 2002, this matter was tried without a jury, and I enter the following Findings of Fact and Conclusions of Law as required by Rule 52(a) of the Federal Rules of Civil Procedure. 1

FINDINGS OF FACT

I. BACKGROUND

This action pits a manufacturer of national brand pharmaceuticals against its competitor, a generic drug manufacturer. Four patents owned by Plaintiff McNeil are at issue in this case: United States Patents 5,248,505 (“the ’505 patent’O(PTXl) and 5,612,054 (“the ’054 patent”)(PTX2) are referred to as “the Gar-win patents”; 2 United States Patents 5,679,376 (“the ’376 patent”) (PTX3) and 5,716,641 (“the ’641 patent”)(PTX4) are referred to as “the Stevens patents.”

A. Plaintiffs Product and the Patents in Suit

Plaintiff McNeil is a subsidiary of a well-known multi-billion-dollar company, Johnson & Johnson. Among other things, McNeil sells over-the-counter (“OTC”) pharmaceuticals, including Tylenol® and Motrin®. (Eble TT at 58.) 3 McNeil’s products can be found in nearly every pharmacy in the United States. (Eble TT at 77-79.)

An antidiarrheal drug known as loper-amide is central to this matter. Loperam-ide, a non-addictive opiate, is believed to treat diarrhea in a number of ways, including: regulating muscular contractions in the intestine, limiting secretions in the intestinal tract, and relieving abdominal discomfort. (Levitt TT at 621-22; PTX721; DX157 at 37.) 4 Also important to the instant controversy is an oily liquid substance known as simethicone, which is employed as an antiflatulent. (Garwin TT at 137.)

During the 1980s, loperamide became the best-selling prescription antidiarrheal in the United States. (Snape TT at 1219.) In March 1988, McNeil began selling lo-peramide as the OTC product Imodium AD. With the January "30, 1990 expiration date for the basic loperamide patent fast approaching, McNeil directed one of its scientists, Dr. Jeffrey Garwin, to develop a new patent-protected form of loperamide. (Garwin TT at 133.) Pursuing this directive, Dr. Garwin developed a drug that combined loperamide with simethicone, and his resulting patent application,, along with continuation applications, led to the issuance of the two Garwin patents: the ’505 patent on September 28, 1993 and the ’054 patent on March 18,1997. (PTX1, 2.)

McNeil initially marketed the loperam-ide-simethicone combination drug as the Imodium Advanced chewable tablet. In developing the Imodium Advanced tablet, McNeil researchers became concerned that over time the simethicone interacted negatively with the loperamide, limiting the drug’s shelf life. (Schwartz TT at 433.) In response, Dr. Charles Stevens and other McNeil researchers considered different ways of keeping an antidiarrheal separated from simethicone. (Schwartz TT at 438-39.) This work became the basis for the Stevens patents. (PTX3, 4.)

B. Perrigo’s Abbreviated New Drug Application (“ANDA”) and the Instant Litigation

With sales exceeding $800 million per year, Defendant Perrigo is the world’s largest manufacturer of store brand — commonly referred to as “generic” — OTC pharmaceutical products. (Needham TT at 798, 800, 804; DX158.) Major retail chains such as Wal-Mart, Rite-Aid, and CVS sell Perrigo’s products under their stores’ respective labels. (Needham TT at 800, 803.) Perrigo’s store brand products generally cost thirty to forty percent less than corresponding national brand products. (Needham TT at 800.)

'Perrigo competes with McNeil in the antidiarrheal market. After the basic lo-peramide patent expired in the late 1980s, Perrigo began marketing a store brand loperamide product similar to McNeil’s Imodium-A-D tablet. (Needham TT at 813-14.) When McNeil introduced the Imodium Advanced combination drug, Perri-go became interested in developing a lo-peramide-simethicone product in order to better compete in the antidiarrheal market. (Needham TT at 814^15.) Pursuing this interest, Perrigo consulted outside patent counsel, who rendered a final opinion that Perrigo’s proposed loperamide-simethicone product would not infringe the Stevens patents and that the Garwin patents were invalid. (Needham TT at 823-27.)

In November 2000, Perrigo filed an Abbreviated New Drug Application with the FDA seeking the approval of a loper-amide-simethicone combination tablet. Thereafter, Perrigo sent a Patent Certification Notice Letter informing McNeil that McNeil’s patents were invalid or not infringed by Perrigo’s ANDA drug. (PTX14.) On March 7, 2001, McNeil filed suit against Perrigo, alleging the infringement of a host of patent claims. .Subsequently, McNeil twice amended its complaint, narrowing the patent claims at issue.

II. The Garwin Patents

Upon its approval by the Food and Drug Administration (“FDA”) in 1977, Janssen Pharmaceutica (“Janssen”), a Johnson & Johnson subsidiary, began selling loperam-ide as a prescription drug. (Eble TT at 65; DX16 at MC13403-06.) McNeil inherited loperamide from Janssen. After lo-peramide was approved as an OTC drug in 1988, McNeil began selling loperamide as Imodium A-D. (Eble TT at 65 — 66; DX16 at MC13404.) With the basic loperamide patent 5 set to expire within two years of McNeil’s launch of Imodium A-D, McNeil asked Dr. Garwin “to come up with a patent-protected form of Imodium.” (Gar-win TT at. 131; DX104) Additionally, following McNeil’s involvement in litigation that resulted in the invalidation of a patent combining ibuprofen and pseudoephedrine, see Richardson-Vicks, Inc. v. Upjohn Co., 122 F.3d 1476 (Fed.Cir.1997), Dr. Garwin was instructed “to think more aggressively about patents.” (Garwin TT at 123-24; DX6 at MC73095). Dr. Garwin described McNeil’s reaction to the Richardson-Vicks litigation as follows:

[T]here was concern at McNeil that there might be other sleeper patents out there that cohld inhibit McNeil's ability to work in the area where McNeil was already working or planning to work, and if there were patents to be had, McNeil wanted to have^ — wanted us to think of them first.

(Garwin TT at 123.)

Following these instructions, Dr. Garwin considered whether a loperamide-based product could relieve certain diarrhea-related symptoms such as flatulence. (Gar-win TT at 115-16.) On November 1, 1989, Dr. Garwin filed his first patent application, claiming the combination of simethi-cone with certain antidiarrheals, including loperamide. (PTX5 at 20-22.) 6

A. The Garwin Patents’ Claims at Issue

Claims 14 and 16 of the ’505 patent and claim 15 of the ’054 patent are at issue. .These claims read as follows:

The ’505 Patent 7

A method for treating a human suffering from an intestinal disorder characterized by the symptoms of diarrhea and flatulence or gas comprising administering to said human in a combined pharmaceutical composition, an effective amount of an antidiarrheal compound selected from the group consisting of loperamide, bismuth subsali-cyclate, diphenoxylate, polycarbophil, their pharmaceutically acceptable salts and mixtures thereof; and an antiflatu-lent effective amount of simethicone, wherein the amount of simethicone administered is 125 mg per dosage unit and the amount of loperamide administered is 2 mg per dosage unit.

Claim 15 of the ’05k Patent 8

A composition of treating a human suffering from an intestinal disorder characterized by the symptoms of diarrhea and flatulence or gas comprising: an effective, amount of an antidiarrheal compound selected from the group consisting of loperamide, bismuth subsali-cyclate, diphenoxylate, polycarbophil, their pharmaceutically acceptable salts and mixtures thereof; and an antiflatu-lent effective amount of simethicone, comprising 125 mg of simethicone and 2 mg of loperamide.

B. Prosecution History 9

During the course of the lengthy prosecution of the Garwin patents, McNeil’s at torneys 10 made a number of- erroneous representations. Two such representations are of critical importance. First, McNeil incorrectly argued to the Patent and Trademark Office (“PTO”) that Dr. Garwin had discovered the concurrence of diarrhea and flatulence:

It is Applicant’s recognition of this problem, i.e., the concurrence of diarrhea and flatulence as indicated in a proprietary survey of patents which forms the basis of the present invention. The invention, therefore, lies not in the discovery of a novel solution to this problem, but in the discovery of the problem itself.

(DX12, p. 48, 67.)

Although his belief to contrary may have been sincere, Dr. Garwin did not discover the concurrence of diarrhea and gas. Moreover, with the exception of a relatively obscure reference in the Handbook of Nonprescription Drugs (“Longe reference”)(DX12 at 326), McNeil’s attorneys failed to provide the Examiner with evidence that would have called into question McNeil’s assertion that Dr. Garwin had discovered the concurrence of diarrhea and flatulence. 11 In fact, as identified by one of Perrigo’s experts, Dr. Michael Levitt, more than twenty prior art articles and publications noted the concurrence of diarrhea and gas-related symptoms. (Levitt TT at 711; PTX420 at 15-18.) As an important example, in the 1983 edition of Sleisenger and Fordtran’s leading textbook, Gastrointestinal Disease, a chapter entitled “Infectious Diarrhea,” authored by Dr. Sherwood Gorbach (“Gorbaeh reference”), included a table indicating that gas was associated with traveler’s diarrhea in seventy-nine percent of occurrences. (Snape TT atll72,1205; DX84-1 at 953.) 12

Second, McNeil’s attorneys permitted the Examiner to believe mistakenly that Dr. Garwin was the first to combine an antidiarrheal with simethicone. In allowing the ’054 patent application to issue, the Examiner stated: “The present application ... is allowable because there was not any prior art or references showing a composition comprising an effective amount of an .antidiarrheal compound and an antiflatu-lent compound.” (DX13 at 186.) Despite having an opportunity to comment on the Examiner’s reasons for allowance, McNeil failed to take any action to correct this error. (DX13 at 184.) More importantly, as is explained below, prior art — including prior art not presented to the Examiner— disclosed such a combination. 13

C. Scope and Content of the Prior Art

1. Antidiarrheals and Antiflatulents at the Time of Dr. Garwin’s Alleged Discovery

By the time of the claimed invention, one of ordinary skill in the art would have known that loperamide was a commercially successful antidiarrheal. (Levitt TT at 585, 596-97.) Additionally, by the time of Dr. Garwin’s alleged discovery, compounds such as attapulgite, polyearbophil, bismuth subsalicyclate, and activated charcoal were well-known antidiarrheals among those of ordinary skill in the art. (DX12 at 338-39.) 14

Since 1974, the FDA has approved the use of simethicone in combination with other pharmaceuticals. (PTX75 at MC97921.) By the time of Dr. Garwin’s claimed invention, simethicone was a well-known and increasingly popular antiflatulent, sold commercially in more than twenty-five products such as Gas-X® and Mylanta®. (DX87-2.)

The dosage regimen in the Garwin patents was not new. Other marketed OTC products contained 125 milligrams of sime-thicone. (DX87.) The amounts specified for loperamide in the Garwin patents were those already used in other OTC products, including Imodium A-D (DX87-2 at PER7645, 7648.)

2. Specific References

At least as early as 1980, an Australian pharmaceutical reference publication, the MIMS Annual (“MIMS reference”), included a reference to a product called “Diareze.” (DX80.) One form of Diareze combined the antidiarrheal attapulgite with simethicone. (DX80 at PER3290.) In describing Diareze, the MIMS reference states: “Simethicone in the suspensions helps relieve the pain and discomfort of gaseous distention....” (Id.) 15

Second, the Chavkin patent covered, inter alia, the combination of polyearbophil and simethicone. (Levitt at TT 727; DX83.) Polyearbophil was a well-known antidiarrheal at the time of Dr. Garwin’s alleged invention. (DX12 at 338-39.) Third, French Patent Publication 2,565,107 taught the use of activated charcoal and dimethicone. (Levitt TT at 725; DX81 at PER239.) Dimethicone is another name for simethicone. (DX132.) Before Dr. Garwin’s alleged invention, activated charcoal had been used as an antidiarrheal. (Levitt TT at 595.)

D. Differences Between the Claimed Invention and the Prior Art

Although the concept of combining an antidiarrheal with simethicone was not new to Dr. Garwin, the prior art does not disclose the exact combination at issue in this case. That is, the Garwin claims in suit combine simethicone with loperamide rather than attapulgite, activated charcoal, or polycarbophil. (Levitt TT at 606-08.) 16

E. Date of Invention and Requisite Level of Skill in the Art

The parties have agreed that “[t]he Gar-win ’054 and ’505 patents relate to the field of identifying combinations of active ingredients for commercial medications for symptoms of diarrhea in conjunction with one or more additional gastrointestinal symptoms.” (DX571, McNeil’s Resp. to Interrog. 6.)

The date of Dr. Garwin’s alleged invention is November 1, 1989, the filing date of the patent application. 17 At that time:

One of ordinary skill in the art of the Garwin ’054 and ’505 patents would have been a medical doctor with pharmaceutical or clinical research experience, or a chemist, biochemist, or pharmacologist with a doctoral degree and with experience in the pharmaceutical industry, and either of which would also have had ability in identifying appropriate and acceptable combinations of active ingredients for commercial medications for symptoms of diarrhea in conjunction with one or more additional gastrointestinal symptoms.

(DX571, McNeil’s Resp. to Interrog. 7).

In addition, one of ordinary skill in the art would have known that loperamide was a commercially successful prescription an-tidiarrheal. (Levitt TT at 595-96.)

F. Motivation to Combine

To counter the powerful attraction of a hindsight-based obviousness analysis, the case law makes clear that Perrigo must show that there was some motivation, suggestion, or teaching of the desirability of making the specific combination at issue. See, e.g., In re Lee, 277 F.3d 1338, 1343 (Fed.Cir.2002). In this case, there was abundant motivation to combine loperam-ide with simethicone. As Dr. Levitt testified:

[At the time of Dr. Garwin’s claimed invention] you want to make a combination that treats diarrhea and gas. The concept is out there. The question is what products are you going to use, and you’re very likely to use, obvious to use, the best-selling antidiarrheal in the United States and combine it with essentially the only compound you can combine it with, which is simethicone, which is the one compound that is approved as efficacious for gas problems in the United States.

(Levitt TT at 670.) 18 Put differently, the prior art, especially the teachings of those references that disclosed the concurrence of diarrhea and flatulence (e.g., the Gor-bach reference) together with those references that combined antidiarrheals with simethicone ( the Chavkin patent, French patent, and the MIMS reference) would have clearly suggested this combination to one of ordinary skill in the art. (Levitt TT at 605-07.) 19

G. Secondary Considerations

The so-called “secondary considerations” are part of the obviousness analysis. Secondary considerations, which relate to objective evidence of nonobviousness, include evidence of commercial success, unexpected results, and copying of the claimed invention.

1. Imodium Advanced in the Marketplace

Evidence of commercial success is a secondary consideration. With the FDA’s approval, McNeil began selling Imodium Advanced in 1997. (Eble TT at 75; McDonagh TT at 181.) Around the same time, McNeil launched a massive $45 million marketing and advertising campaign. (DX67, 135.) McNeil described its marketing plan for Imodium Advanced’s introduction in a sales publication: “With this heavy media-spending plan, Imodium will significantly o'ut-spend all other competitors and remain the category share-of-voice leader.” (DX67 at MC36404.)

In 1997, sales of Imodium Advanced neared $10 million, and approached $27.7 million in 1998, the product’s first full year of sales. (McDonagh TT at 181-82; Wang Goodrich TT at 233, 236; PTX57.) After an initial period of rapidly gaining market share, the rate of Imodium Advanced’s sales’ increases slowed. (PTX57.) 20 Moreover, McNeil’s Imodium A-D product, which contains loperamide without simethicone, remains on the market. (PTX57, 465.) As McNeil recognizes, sales of Imodium Advanced products have come at the expense of sales of Imodium A-D. (Wang Goodrich TT at 274; PTX57.) For the years 1998 through 2001, sales of Imodium Advanced chewable tablets were relatively flat. (PTX57.) 21 In addition, the total amount of sales of Imodium, Advanced chewable tablets and Imodium A-D products has also been relatively flat over the same period. (Id.)

2. McNeil’s Clinical Studies, Unexpected Results, and Synergy

In light of Dr. Garwin’s proposal to combine loperamide and simethicone, McNeil proceeded with an initial clinical study of the combination’s safety and efficacy. Based on the study’s results, McNeil decided to pursue further studies. (PTX123 at MC16631.) Thereafter McNeil conducted three additional clinical studies of a single tablet combining loperamide with simethicone. That tablet was compared to loperamide alone, simethicone alone, and a placebo. (PTX123 at MC16631; PTX111, 114, 118.) Some of these studies’ findings were submitted to the FDA. (PTX63 at PER3501.)

Evidence of unexpected results or synergy may be introduced to a show a claimed invention’s nonobviousness. McNeil contends that the combination claimed in the Garwin patents provides unexpectedly enhanced diarrhea relief, including faster relief in the critical first twelve hours, and that the claimed combination also provides unexpectedly enhanced gas relief. In addition, McNeil argues that these clinical studies demonstrate the existence of synergy for the combination drug 'during the first twelve hours after the initial dose. These contentions are supported by statistical analysis. (Thibodeau TT at 517-19, 526; Kuskowski TT at 767, 773-74; PTX491 at 2, 4, 6; DX676.) 22

Nonetheless, there are problems with the underlying studies that significantly limit their probative value. First, the results of the individual studies were inconsistent and not readily reproducible. (Levitt TT at 652-53.) Second, McNeil’s studies compare only the loperamide-sime-thicone combination to its components individually and to a placebo, and not to a combination of simethicone and another antidiarrheal.- (PTX111, 114, 188, 123 at MC16631.) Third, the studies measured gas relief based solely on subjective criteria such as “mild,” “moderate,” “moderately severe,” and “severe.” (PTX111 at MC13741; Kaplan TT at 332-33.) Fourth, it is not clear that it is proper to combine all four studies for the purposes of statistical analysis. (Thibodeau TT at 528-30.)

Moreover, in assessing McNeil’s evidence of unexpected results, it is significant that as a self-limiting disease, diarrhea “go[es] away on its own, without any treatment.” (Kaplan TT at 311.) Within forty-eight hours of its onset, diarrhea “tend[s] to go away.” (Thibodeau TT at 547). Thus, the amelioration of symptoms may be due to pharmaceutical treatment or the mere passage of time. Among other things, this fact counsels against accepting McNeil’s sweeping assertions that the clinical studies show unexpected results and synergy that are not merely statistically significant, but biologically and medically significant as well.

In view of these problems with the studies and when considering the data as a whole, they largely confirm what one would expect, namely that loperamide is good for treating diarrhea and contributing to the relief of abdominal discomfort, and that simethicone contributes to the relief of abdominal discomfort. (Levitt TT at 621-22, 648.)

3. Copying

Evidence that others have copied the claimed invention is objective evidence of nonobviousness. However, Perrigo did not copy the claimed invention. (Needham TT at 807, 828.) 23 In developing its ANDA product, Perrigo tested a number of different formulations over several years. (PTX10 at 1757-2031.)

III. STEVENS PATENTS

A. Claims at Issue

Like the Garwin patents, the Stevens patents disclose a drug combining loper-amide and simethicone. The Stevens patents add an impermeable polymeric barrier separating the simethicone from the loperamide. (PTX3, col. 12 line 54 — col. 14, line 3; PTX4, col. 12 line 60 — col. 14, line 22.) It is theorized that simethicone migrates over time and surrounds the lo-peramide, hindering its dissolution; by attempting to prevent this migration, the Stevens patents are aimed at an “extended shelf life” and “improved stability.” (PTX3, ’376 patent, col. 3, line 50-57; col. 12, fine 48.) The following claims in the Stevens patents are at issue:

Claims 1 and 2 of the ’376 Patent

1. A solid oral dosage form for the treatment of gastrointestinal distress comprising a therapeutically effective amount of a pharmaceutical for the treatment of gastric disorders selected from the group consisting of diphenoxy-late, loperamide, loperamide-N-oxide, pharmaceutically acceptable salts thereof, and combinations thereof; and

A therapeutically effective amount of simethicone wherein the oral dosage form has a first portion containing the pharmaceutical and a second portion containing simethicone and the first and second portions are separated by a pharmaceutically acceptable polymeric barrier, which is impermeable to simethicone and the pharmaceutical.

2. The solid dosage form of claim 1 wherein the pharmaceutical comprises loperamide HC1.

Claim 1,2 and 3 of the ’61pl Patent

1. A method of enhancing the dissolution profile of a pharmaceutical from a solid dosage form comprising the pharmaceutical and simethicone, comprising:

providing the pharmaceutical in a first portion of said dosage form, said pharmaceutical is selected from the group consisting of diphenoxylate, loperam-ide and loperamide-N-oxide, pharma-ceutically acceptable salts thereof, and combinations thereof; providing the simethicone in a second portion of said dosage form; and separating said first and second portions with a pharmaceutically acceptable polymeric barrier which is impermeable to simethicone and the pharmaceutical.

2. The method of claim 1 wherein the pharmaceutical is selected from the group consisting of loperamide, loperam-ide-N-oxide, pharmaceutically acceptable salts thereof and combinations thereof.

3. The method of claim 1 wherein the pharmaceutical contains loperamide HC1.

Pursuant to Markman, I previously construed disputed claim terms. Specifically, the term “portion” was construed as “a part of the whole”; the term “polymeric barrier” was construed as “a material that is a polymer or contains polymers and which separates the first portion from the second portion”; and the term “impermeable to simethicone and the pharmaceutical” was interpreted as meaning-“not permeable, impassable to simethicone and the pharmaceutical.”

B. Perrigo’s ANDA Product

Perrigo employs a four-step process to make its ANDA product, which is a bilayer tablet. In the first step, the loperamide is formulated into granules. (Schwartz TT at 402; PTX14 at PER930-43; PTX490 at PER10102-10119.) 24 In making the granules, Perrigo agglomerates two milligrams per tablet of loperamide with 148 milligrams per tablet of other materials, namely dextrates, sodium starch glycolate, mi-crocrystalline cellulose, pre-gelatinized starch, and water. During the granulation process, the starch acts as an adhesive, causing the various particles to stick together. (Celik TT at 883-87; Schwartz TT at 405-410.) These granules are blended with various inactive ingredients, making a loperamide layer mix. (PTX14 at PER934; Schwartz TT at 405-06; Dan-ielson Dep. I at 93:10-17.) Next, Perrigo blends simethicone powder with inactive ingredients to make a simethicone layer mix. (Schwartz TT at 402; PTX14 at PER936-40; DX146.) Finally, Perrigo compresses these layers to form a bilayer tablet. (Schwartz TT at 402; PTX14 at 937, 941; DX146.)

C. Impermeable Polymeric Barrier 25

The Stevens patents disclose tablets employing a polymeric barrier that is im permeable to loperamide and simethicone, separating the loperamide in a first portion of the tablet from the simethicone in a second portion. More specifically, the barrier materials disclosed in the Stevens patents form films having smooth surfaces which are not permeable to liquids in general, or simethicone in particular. (DX583, 665, 666.) With respect to the infringement of the Stevens patents, the parties essentially agree that this dispute turns solely on whether the Perrigo’s ANDA product employs an impermeable polymeric barrier. (Pl.’s Post-Trial Br. at 46.)

Simply, Perrigo’s product does not contain an impermeable barrier. Rather than being buried in the granules, as McNeil contends, loperamide particles in Perrigo’s ANDA product are exposed on the surface of the granules. (Celik TT at 888-901; DX638.) Additionally, in at least three different ways, Perrigo’s granules have been readily shown to be permeable. First, mercury porosity tests show that Perrigo’s granules are highly permeable. (Celik TT at 897-99; DX670.) Second, the mercury porosity tests confirm that the loperamide granules have relatively large openings through which simethicone can pass. (Celik TT at 900; DX666.) Third, Perrigo’s granules tend to wick, or soak up the simethicone. (Celik TT at 901-02; DX31 at MC6681.) That is, Perrigo’s granules in fact absorb simethicone. 26

McNeil takes the position that Perrigo’s granules are impermeable because Perri-go’s ANDA product shows a good dissolution profile with respect to loperamide. (Schwartz TT at 475.) This arguments fails, however, because it is inconsistent with the Court’s Markman ruling, in which I rejected McNeil's proposed construction of impermeability that referred to the rate of dissolution of the loperamide. Additionally, the testimony of McNeil’s witnesses belies the contention that impermeability is determined with respect to the rate of dissolution. In particular, Dr. Joseph Schwartz has conceded that good dissolution results can be obtained without infringing the Stevens patents. (Schwartz TT at 480.)

C. Obviousness of Stevens Patents

1. Date of Invention and Requisite Level of Skill in the Art

For present purposes, the date of invention is the filing date of the Stevens patents, May 21, 1992. Like the Garwin patents, the Stevens patents relate to the field of formulating commercial combination patents. (DX571; McNeil’s Resp. to Interrog. 6.) Similarly, at the time of the claimed invention one of ordinary skill in the art was a person having a doctorate degree in pharmaceutics or chemistry, and practical experience in the field of formulating commercial combination medications. (DX571; McNeil’s Resp. to Interrog. 7.)

2. Scope and Content of the Prior Art

a. Garwin Patents

The Garwin patents, in Examples I and II, teach the separation of loperamide from simethicone by putting the two into separate tablet layers. (PTX1, 2.) In these examples, the loperamide and the simethicone are separated by placing the two compounds in distinct layers.

b. Rider and Valentine Patents

United States Patent 4,198,390 (“the Rider patent”) teaches that simethicone is at least temporarily deactivated when combined with antacids. (DX61.) 27 More importantly, the Rider patent teaches that due to the problem of the antacid ingredients deactivating the simethicone one should use a barrier between the antacid and the simethicone. (Id. at col. 2, lines 38^14; col. 5, lines 11-12.) 28 In addition, United States Patent 5,073,384 (“the Valentine patent”) teaches that simethicone migration is prevented when the simethi-cone is adsorbed onto maltodextrin. (DX90.) 29

3. Differences Between the Claimed Invention and the Prior Art

The Garwin patents teach the separation of loperamide and simethicone into two separate layers, whereas the Stevens patents add an impermeable polymeric barrier between the two layers. The Rider patent separates simethicone from an antacid by employing an impermeable polymeric barrier.

4. Motivation to Combine

The pertinent prior art references suggest to one of ordinary skill in the art that the loperamide should be in one layer of the tablet and the simethicone in the other, with an impermeable polymeric barrier between the two. Specifically, the Garwin patents provide the motivation to separate loperamide into one layer of a bilayer tablet, and simethicone into the other. Furthermore, the Rider patent motivates an artisan to include an impermeable polymeric barrier in order to prevent the sime-thicone from migrating from one layer to an adjacent pharmaceutical-containing layer. (DX61, col. 2, lines 38-44, col. 5, lines 11-12.) 30

CONCLUSIONS OF LAW

I. HATCH-WAXMAN ACT

It is significant that the parties in this action are a drug manufacturer and its generic competitor. In enacting the Drug Price Competition and Patent Term Resto ration Act of 1984, Pub.L. No. 98-417, 98 Stat. 1585 (1984), codified at 21 U.S.C. §§ 355, 360cc, and 35 U.S.C. §§ 156, 271 (the “Hatch-Waxman Act”), Congress struck a balance between two competing policy interests: (1) inducing pioneering research and development of new drugs, and (2) enabling competitors to bring low-cost, generic copies of those drugs to market. Pursuant to the Hatch-Waxman Act, a manufacturer that seeks to market a generic drug may submit an ANDA for approval by the FDA, rather than submitting a full New Drug Application (“NDA”) concerning the safety and efficacy of the generic drug. Likewise, the generic manufacturer may rely on safety and efficacy studies previously submitted by the pioneer manufacturer by submitting information showing the generic drug’s bioequiva-lence with the previously approved drug product. See 21 U.S.C. § 355(j)(2)(A). See generally Andrx Pharms., Inc. v. Bio-vail Corp., 276 F.3d 1368, 1370-71 (Fed. Cir.2002).

Here, as the holder of an approved NDA for a chewable loperamide and simethicone tablet, McNeil enjoys a period of exclusivity for its combination product without regard to the protection, if any, afforded by the patent laws. If the patent-holder files suit, the FDA will not approve a generic for marketing under an ANDA until the patent has expired, thirty months have passed since the patentee received notice of the ANDA, or the suit is resolved. See Merck & Co. v. Kessler, 80 F.3d 1543, 1552 (Fed.Cir.1996).

II. INVALIDITY OF GARWIN PATENTS

With respect to the earlier Garwin patents, Perrigo concedes that its ANDA product literally infringes claims 14 and 16 of the ’505 patent, and claim 15 of the ’054 patent, if they are valid. See 35 U.S.C. § 271(e)(2)(defining submission of ANDA as act of infringement). Therefore, the issue with respect to the Garwin patents is whether those patents are invalid as obvious. 31

A. Legal Standard for Obviousness

1. Presumption of Validity

Patents are presumed valid, and the law requires Perrigo, as the patent challenger, to prove invalidity by clear and convincing evidence. See, e.g., Tate Access Floors, Inc. v. Interface Architectural Res., Inc., 279 F.3d 1357, 1367 (Fed.Cir. 2002). Having conceded infringement, Perrigo must clear this high hurdle in order to prove the invalidity of the Garwin patents.

2. Factors Related to Obviousness

Perrigo argues that claims of the Garwin patents at issue are invalid as obvious. A patent is invalid for obviousness:

[I]f the differences between the subject matter sought to be patented and the prior art are such that the subject matter as a whole would have been obvious at the time the invention was made to a person having ordinary skill in the art to which said subject matter pertains.

35 U.S.C. § 103. “Although it is well settled that the ultimate determination of obviousness is a question of law, it is also well understood that there are factual issues underlying the ultimate obviousness decision.” McGinley v. Franklin Sports, Inc., 262 F.3d 1339, 1349 (Fed.Cir.2001) (iciting Richardsovr-Vicks, 122 F.3d at 1479.) Specifically, the obviousness analysis is based on four underlying factual inquiries: (1) the scope and content of the prior art; (2) the differences between the claims and the prior art; (3) the level of ordinary skill in the pertinent art; and (4) secondary considerations, if any, of nonob-viousness. See Graham v. John Deere Co., 383 U.S. 1, 17-18, 86 S.Ct. 684, 15 L.Ed.2d 545 (1966). ‘“[A] reasonable expectation of success, not absolute predictability’ supports a conclusion of obviousness.” Yama-nouchi Pharm. Co. v. Danbury Pharma-col, Inc., 231 F.3d 1339, 1343 (Fed. Cir.2000Xquoting In re Longi, 759 F.2d 887, 896 (Fed.Cir.1985)).

B. Analysis of the Garwin Patents

1.Motivation to Combine

“In holding an invention obvious in view of a combination of references, there must be some suggestion, motivation, or teaching in the prior art that would have led a person of ordinary skill in the art to select the references and combine them in the way that would produce the claimed invention.” Karsten Mfg. Corp. v. Cleveland Golf Co., 242 F.3d 1376, 1385 (Fed.Cir.2001). Furthermore, “[the] case law makes clear that the best defense against the subtle but powerful attraction of a hindsight-based obviousness analysis is rigorous application of the requirement for a showing of the teaching or motivation to combine prior art references.” In re Dembiczak, 175 F.3d 994, 999 (Fed.Cir.1999). This evidence may flow from the prior art references themselves, the knowledge of one of ordinary skill in the art, or, in some cases, from the nature of the problem to be solved. See Pro-Mold & Tool Co. v. Great Lakes Plastics, Inc., 75 F.3d 1568, 1573 (Fed.Cir.1996). Here, filtered through the knowledge of one skilled in the art, the prior art disclosed that flatulence is frequently a concurrent symptom of diarrhea, and that this problem can be addressed by combining a known anti-diarrheal with simethicone. In addition, by the time of Dr. Garwin’s claimed invention, loperamide was a well-known and successful antidiarrheal. Accordingly, there was a clear motivation to combine the loperamide and simethicone.

2. Perrigo’s Prima Facie Case of Obviousness

Considering the date of invention and level of ordinary skill in the art, the scope and content of the prior art, the differences between the accused product and prior art, and the motivation to combine, Perrigo has made out a strong prima facie case of obviousness.

3. Secondary Considerations

A prima facie case of obviousness may be rebutted by secondary considerations. See, e.g., In re Rouffet, 149 F.3d 1350, 1355 (Fed.Cir.1998). Indeed, the secondary considerations “may often be the most probative and cogent evidence,in the record” related to the issue of obviousness. Stratoflex, Inc. v. Aeroquip Corp., 713 F.2d 1530, 1538 (Fed.Cir.1983). “[S]econdary considerations, when present, must be considered in determining obviousness.” Ruiz v. A.B. Chance Co., 234 F.3d 654, 667 (Fed.Cir.2000). In this case, McNeil has advanced a number of arguments in an effort to rebut Perrigo’s strong prima facie case of obviousness. These efforts, however, are unavailing.

a. Unexpected Results

The Federal Circuit has made clear that evidence of unexpected results may provide important evidence that a claimed invention should not deemed obvious:

One way for a patent applicant to rebut a prima facie case of obviousness is to make a showing of “unexpected results,” i.e., to show that the claimed invention exhibits some superior property or advantage that a person of ordinary skill in the relevant art would have found surprising or unexpected. The basic principle behind this rule is straightforward—that which would have been surprising to a person of ordinary skill in a particular art would not have been obvious.

In re Soni, 54 F.3d 746, 750 (Fed.Cir.1995). To show unexpected properties, McNeil must show enhancement in “one of a spectrum of common properties” when that enhancement would not have been expected by one of skill in the art. In re Chupp, 816 F.2d 643, 646 (Fed.Cir.1987). Here, although McNeil has presented evidence tending to show enhancement, there are compelling reasons to question the validity of the underlying clinical studies upon which that evidence is based, and McNeil’s proposition that such evidence was unexpected is doubtful. The results of McNeil’s clinical studies are also of limited relevance because they do not compare the loperamide-simethicone with the closest prior art, i.e., another antidiarrheal and simethicone. See In re Baxter Travenol Labs., 952 F.2d 388, 392 (Fed.Cir.1991).

b. Commercial Success

Sales of the Imodium Advanced tablet have been substantial, and the marketed product is the product disclosed in the Garwin patents. See Demaco Corp. v. F. Von Langsdorff Licensing Ltd., 851 F.2d 1387, 1392 (Fed.Cir.l988)(“[A] prima facie case of nexus is generally made out when file patentee shows both that there is commercial success, -and that the thing (product or method) that is commercially successful is the invention disclosed and claimed in the patent.”) Nevertheless, the probative value of the commercial success of Imodium Advanced is significantly mitigated by the fact that Imodium Advanced’s sales are the calculated result of an aggressive marketing campaign of unprecedented scope in the antidiarrheal market. 32

c. Conclusion

Given the strong prima facie case of obviousness, including the clear motivation to combine, and the limitations and defects in the secondary evidence presented by McNeil, Perrigo has proven by clear and convincing evidence that claims 14 and 16 of the ’505 patent and claim 15 of the ’054 patent are invalid for obviousness. See Richardsorir-Vicks, 122 F.3d at 1483-84.

III. NONINFRINGEMENT OF STEVENS PATENTS

A. Literal Infringement Analysis

After determining the meaning and scope of the asserted patent claims pursuant to Mgrkman, an infringement analysis entails a determination of whether the accused product or method meets each and every limitation of the properly construed claim. See, e.g., Tate Access Floors, Inc. v. Maxcess Techs., Inc., 222 F.3d 958, 964 (Fed.Cir.2000). See also Bai v. L & L Wings, 160 F.3d 1350, 1353 (Fed.Cir.l998)(determination of infringement is question of fact). For the reasons set forth in the findings of fact, Perrigo does not literally • infringe the asserted claims of the Stevens patents.

B. Infringement Under the Doctrine of Equivalents

If a claim element is not literally infringed, infringement may be found under the doctrine of equivalents if the accused product or method contains the equivalent of that claim element. See Warner-Jenkinson Co. v. Hilton Davis Chem. Co., 520 U.S. 17, 40, 117 S.Ct. 1040, 137 L.Ed.2d 146 (1997). As the law stood at the time of trial, when an' amendment narrows the scope of a claim for a reason related to the statutory requirements for patentability, prosecution history estoppel acts as a complete bar to the application of the doctrine of equivalents to the amended claim element. See Festo Corp. v. Shoketsu Kinzoku Kogyo Kabushiki Co., 234 F.3d 558 (Fed.Cir.2000), vacated by 535 U.S.-, 122 S.Ct. 1831, 152 L.Ed.2d 944 (2002). McNeil admits that elements of the asserted -claims of the Stevens patents were amended during prosecution for reasons related to patentability.

After the trial in this case had concluded, the United States Supreme Court decided Festo. In rejecting the Federal Circuit’s complete bar rule, the Supreme Court concluded that although prosecution history estoppel can bar challenges to a wide range of equivalents, its reach requires an examination of the subject matter surrendered by the narrowing amendment:

There are some cases ... where the amendment cannot reasonably be viewed as surrendering a particular equivalent. The equivalent may have been unforeseeable at the time of the application; the rationale underlying the amendment may bear no more than a tangential relation to the equivalent in question; or there may be some other reason suggesting that the patentee could not reasonably be expected to have described the insubstantial substitute in question. In those cases the patentee can overcome the presumption that prosecution history estoppel bars a finding of equivalence.

Id. at 1842. On the record before me, McNeil has not presented any evidence rebutting the presumption that prosecution history estoppel bars McNeil from claiming infringement under the doctrine of equivalents.. Furthermore, Perrigo has proven the invalidity of the Stevens patents; therefore^ I need .not reach the issue of infringement under the doctrine of equivalents.

IV. INVALIDITY OF STEVENS PAT■ENTS

Given the strong prima facie case of obviousness and the minimal secondary evidence presented by McNeil, Perrigo has proven by clear and convincing evidence that 'claims 1 and 2 of the ’376 patent and claims 1 through 3 of the ’641 patent are invalid for obviousness. 33

V. ATTORNEYS’FEES

An award of attorneys’ fees to the prevailing party is authorized in an “exceptional” case. See 35 U.S.C. § 285. In assessing whether a case qualifies as exceptional, I must consider the totality of the circumstances. See Kaufman Co., Inc. v. Lantech, Inc., 807 F.2d 970, 978-79 (Fed.Cir.1986). As the party seeking attorneys’ fees, Perrigo must prove the exceptional nature of the case by clear and convincing evidence. See Eltech Sys. Corp. v. PPG Indus., Inc., 903 F.2d 805, 810-11 (Fed.Cir.1990). Exceptional cases are normally those involving bad faith litigation or misconduct by the patentee in procuring the patent. See Cambridge Prods., Ltd. v. Penn Nutrients, Inc., 962 F.2d 1048, 1050-51 (Fed.Cir.1992). Particularly during the prosecution of the patents in suit, McNeil’s conduct was careless, irresponsible, and," at the very least, tantamount to studied and deceptive ignorance. See Brasseler, U.S.A. I, L.P. v. Stryker Sales Corp., 267 F.3d 1370, 1384 (Fed.Cir.2001). McNeil’s repeated erroneous representations, failure to disclose relevant prior art, and overall persistence in prosecuting exceedingly obvious “inventions” make this case exceptional.

Although McNeil’s misconduct during prosecution alone makes this case exceptional, there is further evidence warranting an award of attorneys’ fees. It is significant that McNeil is a highly sophisticated party, readily capable of assessing not only the merits of its claimed invention, but also its expected profits as compared .to the costs that would be incurred in the event that their patents were held invalid. Put differently, the Garwin and Stevens patents amount to a scheme for extending the life of a drug about to go off patent, and McNeil executed this scheme without the slightest regard for the intent and purposes of the patent laws. Indeed, McNeil’s sole motive was to compromise these statutes and constitutional protections for the sake of profits.

CONCLUSION

The patent laws “promote the Progress of Science and useful Arts” by rewarding innovation with a temporary right to exclusivity. U.S. Const., art. I, § 8, cl. 8. See also Festo, 122 S.Ct. at 1837. 34 Long ago, in Hotchkiss v. Greenwood, 52 U.S. 248, 11 How. 248, 267, 13 L.Ed. 683 (1850), the Supreme Court established that the sine qua non of patentability is invention, and as stated in 35 U.S.C. § 100(a), the legal definition of invention is synonymous with discovery. As is widely understood, a discovery is an act of “gaining knowledge of or ascertaining the existence of something previously unknown or unrecognized.” Webster’s Third New International Dictionary 647 (1993). Over time, patent law has developed its own, new language, and has even come to require special qualifications for lawyers appearing before the PTO. These developments tend to ob scure the fundamental notions of invention and discovery.

Acting within this often esoteric area of the law, patent lawyers are called upon to play the roles of chemists, engineers, physicians, and physicists — now, they are also asked to be magicians. That is, patent lawyers are asked to defend — with smoke and incantations when necessary — business-driven decisions having nothing to do with inventing or discovering anything. Consistent with schemes to prolong the legally-protected period of exclusivity, companies hire highly talented attorneys to perform acts of legal legerdemain in order to make modest developments look and feel like inventions, when in reality the purported discovery is nothing more than a creation of an advertising and marketing department. In-house counsel should be cautioned that complicity in patent prosecution for unsanctioned legal purposes may give rise in the future to review of that behavior by the appropriate attorney disciplinary machinery. Advancing a client’s economic interests is not a license to forget one’s ethical responsibilities.

It is not lost on this Court that by developing (“not inventing”) a combination drug, the law automatically permitted McNeil a three-year period of exclusivity, which ran from October 1997 to October 2000. However, by concocting multiple patent applications and litigating their validity, this period of exclusivity has been extended by two years and, with an appeal, will extend even further, effectively doubling the initial period of exclusivity. The business-driven decision that it is worth the investment to “invent an invention” will continue unabated unless a vigorous PTO or a Court sees this transparent attempt to subvert the patent laws for what it is. The patent laws are not the private sandbox of pharmaceutical companies. Regrettably, I am constrained by law to award only counsel, fees for Plaintiffs behavior, although I am not unmindful of the fact that while this patent litigation continues, competition in the marketplace is foreclosed and the public is forced to pay higher prices.

While the trial attorneys in this case have proven themselves informed, articulate, and instructive, in the end J was left to dispel the illusions ■ concealing the true nature of the “invention” to reach my own conclusion: as Gertrude Stein phrased it, “there is no there there.”

An appropriate Order follows.

ORDER

AND NOW, this day of June, 2002,upon consideration of the parties’ Proposed Findings of Fact and Conclusions of Law and Post-Trial Briefs, Plaintiffs Motion to Strike. New Affirmative Defenses and Counterclaims, Defendants’ Motion for Attorney’s Fees, and the record and the applicable law, and for the foregoing reasons, it is hereby ORDERED that:

1. Plaintiffs Motion to Strike New Affirmative Defenses and Counterclaims (Document No. 90) is DENIED as moot.

2. Defendants’ Motion for Attorney’s Fees (Document No. 101) is GRANTED.

3. It is DECLARED that claims 14 and 16 of United States Patent 5,248,505 are invalid, and judgment is ENTERED in favor of Defendants and against Plaintiff on Plaintiffs claim for infringement of United States Patent 5,248,505.

4. It is DECLARED that claim 15 of United States Patent 5,612,054 is invalid, and judgment is ENTERED in favor of Defendants and against Plaintiff on Plaintiffs claim for in fringement of United States Patent 5,612,054.

5. Judgment is ENTERED in favor of Defendants and against Plaintiff on Plaintiffs claim for literal infringement of United States Patent 5,679,-376.

6. Judgment is ENTERED in favor of Defendants and against Plaintiff on Plaintiffs claim for literal infringement of United States Patent 5,716,-641.

7. It is DECLARED that claims 1 and 2 of United States Patent 5,679,376 are invalid.

8. It is DECLARED that claims 1, 2, and 3 of United States Patent 5,716,-641 are invalid.

9. Defendants shall submit a petition for counsel fees by July 10, 2002. Plaintiff shall have until July 29, 2002 to file a response.

1 . This action arises under the patent laws of the United States. See 35 U.S.C. § 271(e)(2) and 21 U.S.C. § 355(j). Jurisdiction is based on 28 U.S.C. §§ 1331 and 1338(a). Venue is proper in this Court pursuant to 28 U.S.C. §§ 1391(c) and 1400(b).

2 . The '505 patent covers a method for treating gastrointestinal distress; the '054 patent covers the related pharmaceutical composition.

3 . The trial transcript is cited in the following format: (name of witness) TT at (transcript page(s)).

4 . Many exhibits contain multiple page number designations. Where more than one designation is present, the clearest page number designation is cited.

5 . United States Patent 3,714,159 (DX104.)

6 . In each of the four patents in suit, loperam-ide is among a list of antidiarrheals that may be combined with simethicone. No evidence suggests, however, that McNeil seriously considered any antidiarrheal other than loperam-ide for its Imodium products.

7 . Claim 14 of the '505 patent incorporates claims 1 and 2 and is set forth accordingly herein to include these limitations.

8 . Claim 15 of the '054 patent incorporates claims 1 and 2 and is set forth accordingly herein to include these limitations.

9 . McNeil argues that in the absence of inequitable conduct, evidence relating to improper patent prosecution is irrelevant. This argument appears to miss the mark. See Applied Materials v. Advanced Semiconductor Materials Am., 98 F.3d 1563, 1570 (Fed.Cir.1996)("facts relevant to the issue of obviousness were before the district court, including ... prosecution history in the PTO”). In any event, what happened before the PTO in this case does not affect the statutory presumption that the Garwin patents are valid. The discussion of the prosecution history is primarily intended to highlight fundamental flaws in McNeil's contention that the Garwin patents are nonobvious. Lastly, the history of the Garwin patents' prosecution reveals that certain comments made by Judge Learned Hand seventy-five years ago are no less apt today: "[T]he antlike persistency of [patent] solicitors has overcome and ... will continue to overcome, the patience of examiners, and there is apparently always but one outcome.” Lyon v. Boh, 1 F.2d 48, 50 (S.D.N.Y.1924).

10 . McNeil’s trial counsel did not represent McNeil during the prosecution of the Garwin or Stevens patents.

11 . The Longe reference states: "Acute diarrhea is characterized by a sudden onset of frequent, liquid stools accompanied by weakness, flatulence, pain, and often fever and vomiting.” (DX12 at 326). In this regard, it is noteworthy that McNeil’s attorneys did not point out this statement to the Examiner. Instead, they cited the Longe reference because it "discloses antidiarrheal and other gastrointestinal products. No suggestion is made for combining antidiarrheal with antiflatulent compositions.” (Id. at 26.)

12 . Traveler’s diarrhea is one of the most common forms of diarrhea, affecting millions of people annually. (DX84-1 at 953.)

13 .McNeil made other erroneous representations during the prosecution of the Garwin patents. For example, while prosecuting the Garwin patents McNeil misleadingly relied on an article that found that simethicone did not reduce gas in the colon ("Jain article”). (DX12 at 180-81.) The results reported in the Jain article, however, were based on a study involving only nine participants and did not rise to the level statistical significance. Other studies, including a study by Drs. Alfred Rider and Hugo Moeller, found that simethicone treated intestinal gas and bloating in 75.5 percent of the 200 patients studied. (DX103-1.) Although McNeil later provided the PTO with numerous articles tending to show the effectiveness of simethicone, these articles were not submitted until after the '505 patent had issued. (DX13 at 123-70.)

14 . At the time of the claimed invention, bismuth subsalicyclate was sold as Pepto-Bismol ®, and attapulgite was an ingredient in the tablet form of Kaopectate ®. (DX12 at 338-39.)

15 . McNeil did not present the 1980 edition of the MIMS Reference during the prosecution of either the '505 patent or '054 patent. (PTX5, 6.)

16 . McNeil attempts to draw a distinction between the Garwin patents and the prior art references based on the fact that the prior art involves absorbent and adsorbent antidiar-rheals, instead of an opiate-type antidiarrheal, like loperamide. On the one hand, absorbent and adsorbent materials take up and remove some of the toxins and bacteria present in the intestinal tract. Absorbent materials also solidify the intestinal contents by absorbing excess water. Loperamide, on the other hand, acts locally in the intestine to: (1) regulate muscular contractions of the intestinal tract; (2) limit the excess amount of secretions made by the intestinal tract as a reaction to toxins in a diarrheal state; (3) increase absorption of water across the intestinal musco-sa so that the water can be reabsorbed into the body; and (4) increase anal sphincter pressure, thus treating the patient’s fecal incontinence. (Garwin TT at 108-122.) Atta-pulgite had been found to be comparable in efficacy to loperamide. (DX157 at 37.) McNeil's argument, however, sets up a distinction without a meaningful difference. Significantly, Dr. William Snape, one of McNeil’s expert witnesses, offered no explanation regarding why a difference in the mode of operation of an opiate-type antidiar-rheal as compared to an absorbent/adsorbent-type antidiarrheal would deter one of ordinary skill in the art from combining loperam-ide with simethicone. (Snape TT at 1218-20.)

17 . Priority of invention "goes to the first party to reduce an invention to practice unless the other party can show that it was the first to conceive the invention and that it exercised reasonable diligence in later reducing that invention to practice.” Price v. Symselc, 988 F.2d 1187, 1190 (Fed.Cir.1993). While Dr. Garwin’s notebook includes a memorandum of September 23, 1988 documenting his conception of combining loperamide and simethi-cone in a single composition to treat diarrhea and gas, at trial McNeil failed to produce any evidence of diligence in reducing the alleged . invention to practice. However, because McNeil has not established when the claimed invention was actually reduced to practice, the filing date of the first Garwin patent application serves as the date of constructive reduction to practice. See Hyatt v. Boone, 146 F.3d 1348, 1352 (Fed.Cir.1998). In light of this date of invention, the Chavkin patent is prior art.

18 . McNeil argues that the fact that no one had written about combining loperamide with simethicone suggests the absence of a motivation to combine the two. This argument assumes that others were not disinclined to write about such a combination because of the sheer obviousness of that combination. McNeil also contends that the fact that certain antidiarrheals, particularly bismuth sub-salicyclate, had not been combined with sime-thicone suggests the nonobviousness of the Garwin patents. There is a plausible medical explanation, however, for why bismuth sub-salicyclate was not combined with simethi-cone; there is evidence that bismuth subsali-cyclate itself was understood to act as an antiflatulent. (Snape TT at 1207-08.) Furthermore, McNeil advances the argument that the lack of evidence regarding whether sime-thicone reduced intestinal gas would deter one of ordinary skill in the art from considering the loperamide-simethicone combination; this argument is unconvincing for two reasons. First, this argument ignores the fact that three other antidiarrheals had previously been combined with simethicone for the treatment diarrhea and flatulence. Second, this contention is inconsistent with McNeil’s statement to the PTO that it did "not disagree that simethicone is a known composition for the treatment of flatulence....” (DX12 at 40.)

19 . In view of the fact that the basic loperam-ide patent was nearing expiration, to a McNeil researcher, the motivation to combine loperamide with simethicone would have been overwhelming.

20 . McNeil's projections indicate that the total sales of all Imodium Advanced products will approach $200 million by the end of 2002. (PTX57, 455 at MC100885).

21 . In 2001, McNeil began selling an Imodium Advanced caplet. (Wang Goodrich TT at 229.) The total amount of sales of all of McNeil's Imodium products — including sales of the caplet — increased in 2001. (PTX57.) It is noteworthy that this sales increase corresponds with an increase in advertising expenditures. (PTX464.)

22 .After its claims had been twice rejected for obviousness, as predicted by Judge Learned Hand, McNeil returned to the PTO to argue that unexpected results proved that the Gar-win patents were nonobviousness.

23 . To the extent that a generic drug manufacturer’s attempt to create the bioequivalent of a pioneer manufacturer’s drug, without more, may be considered copying, I note that a showing of copying is only equivocal evidence of nonobviousness. See Ecolochem, Inc. v. S. Cal. Edison Co., 221 F.3d 1361, 1380 (Fed.Cir.2000)(citing In re GPAC, 57 F.3d 1573, 1580 (Fed.Cir.1995)).

24 . The polymeric materials Perrigo uses in its tablet are disclosed in. the Stevens patents only as excipients, with no statement that they could function as impermeable barrier materials or as impermeable polymer coatings. (PTX3, 4.)

25 . Perrigo has taken the position that certain materials used in its ANDA drug are not polymeric, and, on this basis, the Stevens patents are not infringed. At trial, both parties presented evidence related to whether certain materials should be considered “polymeric.” At bottom, this dispute raises the question— primarily of interest to a semanticist — of whether "monomeric” and "polymeric” are mutually exclusive terms. In light of my construction of "polymeric” as "a material that is a polymer or contains polymers,” Perrigo's product does contain polymeric materials.

26 . Perrigo's evidence that its tablet absorbs simethicone is supported by a statement made by McNeil. In an report not prepared for the purposes of this litigation, McNeil’s expert described dextrates, one of the principal ingredients in Perrigo's ANDA product, as "pro-vid[ing] absorptive capacity for simethicone oil." (DX31 atMC6681.)

27 . The figures included in the Stevens patents are identical to those in the earlier Rider patent.

28 . French Patent Publication 2,565,107, discussed above in connection with the Garwin patents, teaches an additional configuration, namely an onion-like layering system, for separating simethicone from an antidiarrheal at-tapulgite. (DX132.).

29 . Significantly, Perrigo’s ANDA product also employs the mechanism of adsorbtion to prevent simethicone migration.

30 . McNeil takes the position that the motivation to combine is absent because the prior art failed to indicate that simethicone effected the dissolution of the loperamide. However, one of McNeil’s experts, Dr. Schwartz, admitted at trial that the Rider patent and Stevens patents are directed at solving the same problem:

Q: What do the Stevens’ patents have to say about [the simethicone migration problem]?

A: Well, their invention prevents the sime-thicone from migrating into the pharmaceutical.

Q: [Y]ou would accept agree with me that Ryder [sic] discloses an invention for preventing simethicone from migrating into the pharmaceutical?

A: I’ll accept that.

Put differently, Dr. Schwartz considered the Stevens patents and Rider patent as disclosing the same “invention,” namely the prevention of simethicone migration into the pharmaceutical.

31 . In its Answer and Counterclaims, Perrigo pled defenses under 35 U.S.C. §§ 102 and 112. However, Perrigo failed to raise this defense in its claim-by-claim defenses or at trial. At trial, Perrigo’s only defense to its admitted infringement of the Garwin patents was that the asserted claims are invalid for obviousness under 35U.S.C.§ 103.

32 . McNeil’s marketing expenditures appear to be consistent with an overall strategy for stymieing generic competition. By heavily promoting the combination product, McNeil can in effect transfer sales from the non-patent-protected loperamide product to its combination drug. Regardless of whether the combination drug ultimately gains patent protection, this combination drug enjoys a significant period of exclusivity pursuant to the Hatch-Waxman Act. Moreover, because lo-peramide is sold in generic form, McNeil benefits from the transference of sales from the loperamide-alone product to its combination drug.

33 . Because I have found that the Stevens patents are not infringed, I need not reach Perrigo’s alternative arguments that the Stevens claim lack definiteness and fail to distinctly claim the invention. (Def. Post-Trial Br. at 75.) Furthermore, having found that the Stevens patents are invalid for obviousness, I need not reach the host of other arguments Perrigo advances in support of its position that the Stevens patents are invalid. See Enzo Biochem, Inc. v. Calgene, Inc., 188 F.3d 1362, 1369 (Fed.Cir.1999). .

34 . As early as 1813 Thomas Jefferson, the first administrator of the United States Patent Office, memorialized in writing his critical view of the excessive issuance of patents. "Instead of refusing a patent in the first instance, as the board was authorized to do, the patent now issues of course, subject to be declared void on such principles as should be established by the courts of law.” 13 The Writings of Thomas Jefferson 336 (A. Bergh ed.1907). Jefferson explained the reasons for these objections with eloquence that continues to resonate:

[The idea's] peculiar character, too, is that no one possesses the less, because every other possesses the whole of it. He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me. That ideas should freely spread from one to another over the globe, for the moral and mutual instruction of man, and improvement of his condition, seems to have been peculiarly and benevolently designed by nature, when she made them, like fire, expansible over all space....

Id. at 333-34.