Application of Habet M. Khelghatian

364 F.2d 870, 53 C.C.P.A. 1441

• Court: Court of Customs and Patent Appeals
• Decided: August 4, 1966
• Docket: Patent Appeal 7606
• Status: Published

Opinions

RICH, Acting Chief Judge.

This appeal is from the unanimous decision of the Patent Office Board of Appeals¹ affirming the examiner’s rejection of process claims 1-3, 5, 7, and 8 in application serial No. 52,211, filed August 26, 1960, for “Process for Removing Carbonyl Sulfide from Normally Gaseous Hydrocarbons.” No claim is allowed.

The invention relates to the removal of carbonyl sulfide (COS) from normally gaseous hydrocarbons, obtained from refining and cracking processes and employed in numerous conventional applications. COS is an impurity frequently found in such hydrocarbons and often has a deleterious effect on their use, as, for example, in the polymerization of propylene to polypropylene where the COS, if present even in small amounts, poisons the polymerization catalyst.

Appellant invented a method for lowering the COS concentration-in such hydrocarbons to levels less than 0.5 ppm (parts per million) by treating the hydrocarbons in liquid phase with soda-lime, defined in the specification as “lime which has added thereto sodium hydroxide * * The term “lime” is said to include quicklime and hydrated lime, the former being the product of calcining limestone, i. e., calcium oxide and magnesium oxide primarily, the latter being a dry powder obtained by treating quicklime with enough water to satisfy its chemical affinity therefor. The hydrocarbons may be “scrubbed” with a monoethanolamine (MEA) solution, prior to contacting with soda-lime, to remove “the acid gases, H2S, C02, etc. and part (from 20% to 90%) of the carbonyl sulfide.”

Claim 1 reads:

1. Process for purify [sic] liquefied normally gaseous hydrocarbons containing carbonyl sulfide which comprises contacting the liquid hydrocarbons with soda-lime.

Claims 2 and 7 are dependent on claim 1 and define preferred embodiments of the invention there defined, claim 2 being limited to propylene and claim 7 being limited to hydrocarbons containing from 34-167 ppm COS. Claim 3 recites a polymerization process in which liquid propylene is first treated with soda-lime to remove COS and is then polymerized. Claim 5 recites a process in which a liquid mixture of normally gaseous hydrocarbons is first treated with MEA to remove some of the COS after which propylene is separated from the mixture and the separated propylene is then treated in liquid phase with soda-lime to remove the remaining COS therefrom. Claim 8 recites a process in which liquefied propylene having a specified COS content is treated with soda-lime to reduce the COS content to 0-5 ppm.

The references are:

Karchmer et al. 3,000,988 Sept. 19, 1961 Fleming etal. 2,959,627 Nov. 8, 1960 Schulze et al. 2,301,588 Nov. 10, 1942

The U. S. filing dates of the first two antedate appellant’s filing date.

Karchmer et al. disclose the removal of COS from gases containing same by contacting the gas with soda-lime, which, according to the patentees, “is a very good absorption material.” Light, olefinic gases obtained from the catalytic cracking of petroleum, particularly ethylene, are disclosed, and it is stated that the purified ethylene is such as to be usable in the production of polyethylene. Preferably the gas is pretreated to remove various acidic gases by scrubbing, for example with an aqueous solution of sodium hydroxide, and to remove moisture, for example by passing the gas through a bed of activated alumina. Karchmer et al. make no mention of using soda-lime to remove COS from materials in liquid phase.

Fleming et al. disclose an “improved method for purifying olefins [obtained from pyrolyzing refinery gas, kerosene, gas oil, etc.] which are contaminated with highly unsaturated compounds and compounds of sulfur.” The patentees first selectively hydrogenate the acetylenic and diolefinic compounds in the gas mixtures without appreciably converting the monoolefins such as propylene and butylene, and then pass the treated gas over “an organic sulfur conversion catalyst,” disclosed in the specification as comprising “the oxides or sulfides of iron or copper separately or in admixture with the oxides of the metals of the left hand side of the 6th group of the periodic table,” namely, chromium, molybdenum, tungsten, etc., “to selectively convert the carbonyl sulfide to hydrogen sulfide” again without substantially destroying the low molecular weight monoolefins. The desirability of removing COS from both ethylene and propylene is discussed, it being also pointed out that:

The problem of removal of carbonyl sulfide was not serious in the purification of ethylene for the production of polyethylene since the carbonyl sulfide was removed with the C3 fraction in the ethylene concentration procedure. Both carbonyl sulfide and propylene have a boiling point of about -50°C. which renders removal by fractionation essentially impossible. Thus propylene separated from pyrolysis mixtures by conventional procedures will contain high percentages of carbonyl sulfide which must be reduced to a concentration of about 10 p.p.m. to be suitable for use in the production of plastics.

Schulze et al. disclose the removal of COS from hydrocarbon fluids such as the normally gaseous hydrocarbons by treating the fluid with an adsorbent material impregnated with an organic base such as monoethanolamine. In a preferred embodiment the adsorbent is also impregnated with a lead salt in addition to the monoethanolamine. The patentees say:

We usually prefer to treat in liquid phase since the volume of reagent required for nominal flow rates, say 0.5 to 5 volumes per hour per volume of reagent is not excessive. However, gas or vapor phase treating of normally gaseous hydrocarbons is satisfactory if provision is made in the size of the reagent bed to allow contact times corresponding to linear vapor velocities under five feet per minute.

The issue therefore is: would it be obvious to treat normally gaseous hydrocarbons in liquid phase with soda-lime to remove COS therefrom when the prior art shows the treatment of such hydrocarbons in vapor phase with soda-lime for the same purpose and the prior art also shows the treatment of such hydrocarbons in both liquid and vapor phase with a MEA type treating agent for the same purpose ?

There appears to be agreement of the parties that essential to the proper resolution of this issue is a consideration of all the record evidence, including an affidavit filed under Rule 132. Such has been the law in this court for several years, and that regardless of whether any “doubt” as to patentability exists upon an examination of the prior art alone.² The aforesaid affidavit purports to establish as fact that appellant’s treatment of hydrocarbons in the liquid phase rather than the gas phase taught by Karchmer et al. gives “vastly superior results” in treatment of the same hydrocarbons. It is admitted that “essentially the entire case of appellant is based on the affidavit,” and so it seems to us. We are concerned primarily with (1) whether these superior results have been shown and (2) if so, whether they would be unexpected.

What the affidavit shows is a comparison of two experiments, in each of which a charge stock consisting of propylene containing 250 ppm COS was passed through a reactor consisting of a two-inch diameter steel pipe, three feet in length, containing 3.1 pounds of commercial soda-lime. In “Run A — Vapor Phase Operation,” the charge stock was passed through the reactor at a temperature of 15°F., a pressure of 50 psig, and a rate of 4.4 pounds propylene per hour per pound soda-lime; in “Run B— Liquid Phase Operation,” the charge stock was at a temperature of 75 °F., a pressure of 140 psig, and was passed through the reactor at a rate of 4.8 pounds propylene per hour per pound soda-lime. The effluents were periodically analyzed for COS content, it being explained in the affidavit, that for polymerization of propylene to solid polymers the maximum tolerable COS content is 5 ppm^ — a so-called “break-through” value. This value was reached in Run A (gas phase) after a little more than one hour’s operation and was reached in Run B (liquid phase) only after about 12 hours’ operation.

Regarding this work, affiant Duff, a chemical engineer under whose supervision the experiments were performed said:

The data for these runs * * * clearly demonstrates the unexpectedly superior carbonyl sulfide removal efficiency of the liquid phase process when compared to the vapor phase process. In his opinion those skilled in the art would have been surprised to find that the liquid phase operation was significantly more efficient than the vapor phase operation, particularly, when the amount of propylene charged to the process was somewhat greater for the liquid phase run (4.8 #/hr./#) than for the vapor phase run (4.4 #/hr./#). The fact that applicant’s liquid phase process is almost ten to twelve times more efficient than the prior art vapor phase process is striking proof that such liquid phase operation is not merely a matter of choice available to one skilled in the art.

Affiant also states that the process claimed in the subject application is used in a propylene purification plant having a capacity of 120,000,000 pounds of purified propylene per year and that, in his opinion, “similar superior results would be found when charging other normally gaseous hydrocarbons in liquid phase to applicant’s process.”

It is against this background that the examiner, in his answer to appellant’s brief before the board, said:

Applicant argues the unexpected result using liquid phase contact by referring to an affidavit under Rule 132 (Paper No. 16) submitted to show a comparison between liquid and vapor phase contact. This data is in part reproduced on pages 13 and 14 of applicant’s brief. Such a showing is not convincing of the patentability of liquid over vapor phase contact. It merely discloses that over an extended period of time, liquid phase contact is more efficient than vapor phase contact. However, applicant’s claims are silent as to the length of time of contact so that any advantage of using liquid over vapor phase does not appear in the claims.

It is further noted that the comparative results are merely a comparison of a single temperature and pressure with another single temperature and pressure. To conclude from such a showing that alleged unexpected results are dependent on a difference in phase, which includes many different temperature and pressure variations, would appear to be a stretch of inductive conclusions. Upon viewing the Karchmer et al. data (columns 3 and 4) it is seen that C.O.S. concentrations are obtained in the gas phase which vary from 0.2 p.p.m. to 74.8 p.p.m., the former being less than that in either phase of applicant’s affidavit tests.

Notwithstanding the fact that applicant may obtain an improved efficiency using particular conditions such a showing cannot lend patentability to the present claims for a more basic reason. Schulze et al. disclose the fact that liquid phase contact is known in carbonyl sulfide removal systems. Accordingly, it would be obvious to try liquid phase contact in the Karchmer et al. carbonyl sulfide removal process, so that no matter what result was obtained thereby, such a feature would not be patentable. It is noted that by using liquid as opposed to vapor phase, applicant merely obtained the expected result, namely, removal of carbonyl sulfide. To obtain even an improved efficiency is a matter of degree not a difference in kind.

The essence of the board’s position is:

While we disagree with the Examiner and do consider that the Rule 132 affidavits [sic: affidavit], on the basis presented, demonstrate an apparent improved result, this improvement is not an unexpected one in view of the differences to be anticipated between vapor and liquid-phase operations at the same through-put. As is evidenced by Schulze et al. (page 3, column 1, last paragraph) linear velocities and apparatus must be altered to obtain equivalent results in vapor-phase operation as compared with liquid-phase operation.

We agree with the Examiner’s position as expressed in his Answer except for his interpretation of the affidavit results noted above, and possibly with the choice of language in the expression “obvious * * * to try”. In our opinion it would be obvious to substitute, in the Karchmer et al. vapor-phase contact of olefinic hydrocarbons with soda-lime, the known engineering alternative of liquid-phase operation. This substitution with the requisite alteration of apparatus and process parameters to obtain equivalent results is clearly taught in the above-indicated paragraph in Schulze et al.

We think a reasonable interpretation of the board’s position is that appellant’s affidavit does establish his process to be more efficient than that of the prior art, but that such an improved efficiency would have been expected from a reading of the Schulze et al. disclosure and therefore does not put appellant in a more favorable position on the question of patentability. ■

While much theoretical discussion has been presented, for the first time in the three briefs filed here, about the true nature of the phenomenon occurring within the “reactor”; about the effect or effects thereon resulting from changes in temperature, pressure, through-put, etc.; about what this phenomenon has been labeled in appellant’s specification, in both its original and amended form; about the nature of the phenomena occurring in the prior art processes; about the necessity, or lack of it, for the number of variations in conditions between Run A and Run B reported in the affidavit; and about the significance of variations in conditions between Run B (the liquid phase operation) and those reported in an example in the specification, we find the arguments on most of these points of little help in drawing conclusions about the issues there discussed. What we have been able to conclude from this discussion, however, is that what appellant attempted to compare in his affidavit was the effect on COS removal of liquid vs. vapor phase, and that what he had hoped to do was to maintain temperature, through-put, and all other parameters except pressure constant, the variation in pressure being necessary and responsible for the difference in phase. Instead, because of “unforeseen mechanical limitations in the equipment in which the experiments were performed,” appellant says, temperature and through-put were not held constant. Whether the effect of these variations was to decrease rather than increase the efficiency of liquid phase operation, as contended by appellant, is a point we feel it unnecessary to decide since we have not been persuaded by the Patent Office arguments that “an apparent improved result,” to quote the board, does not in fact exist. Thus we, like the board, believe the important consideration is whether such an improvement in efficiency was to be expected. We think it was not.

As we recently said in In re Neely, 361 F.2d 255, 53 CCPA-:

The appealed claims are all method claims, but, so far as the issue of obviousness is concerned, the considerations applicable are no different from [those pertaining to] claims for physical structures or arrangements.

We therefore agree with appellant that:

The improved results achieved in the soda-lime treatment of normally gaseous hydrocarbons in liquid phase as opposed to vapor phase is a property of appellant’s process which is to be considered in determining the obviousness of appellant’s claimed invention. In re Papesch, 315 F.2d 381, 50 CCPA 1084.

In support of its position that appellant’s improvement would be expected in view of “the differences to be anticipated between vapor and liquid-phase operations at the same through-put,” the board pointed to the passage in Schulze et al. which we have set out above in discussing that reference. This is all the evidence the board provides, and, after a diligent search of the record and briefs, we find it is all the examiner and solicitor-have provided.

While the Schulze et al. disclosure undoubtedly says that linear velocity and apparatus must be altered in going from liquid to vapor phase operation, and presumably vice versa, to obtain equivalent results, we think that is all that it says. We find no disclosure or suggestion that liquid phase operation would give more efficient COS removal. That, however, is what appellant claims to have found. While a teaching that another, albeit related, process can be carried out in both gas and liquid phases may suggest the possibility of carrying out the Karchmer et al. process in liquid phase, by making certain alterations, this is not tantamount to a disclosure of how to make those alterations and, more importantly, that a substantially improved efficiency will result.

We have considered the solicitor’s reliance upon In re Leum, 158 F.2d 311, 34 CCPA 762; and Ex parte Appeal No. 13,231 ³ for the proposition that because “the use of liquid phase in a known vapor phase process is well known to the chemical engineer,” a disclosure of one type of process renders the other unpatentable. However, we find those arguments unpersuasive. Here the invention is more than a mere change from the vapor to the liquid phase; it also includes the discovery that by so doing, a much greater efficiency is obtained.

We also find unpersuasive the solicitor’s contention that the affidavit “is entitled to no weight whatsoever” because it is not directed to an unexpected property “within the ambit of the original disclosure,” quoting from In re Herr, 304 F.2d 906, 907, 50 CCPA 705, which opinion had in turn quoted the board. We think Herr not to be support for an affirmance for two reasons: (1) what was said there was not that the affidavit was entitled to no weight, but only that if the advantage is not disclosed in the application appellant is “not in a favorable position to urge it as a basis for the allowance of claims” (emphasis ours), citing In re Lundberg, 253 F.2d 244, 45 CCPA 838; (2) here we think the affidavit is directed to that which “would inherently flow” from what was originally disclosed, which is an interpretation we put on Herr in In re Zenitz, 333 F.2d 924, 52 CCPA 746.

Since we find the improvement appellant found has not been suggested by the prior art, we hold the claims to be patentable. In re Carabateas, 357 F.2d 998, 53 CCPA —.

The decision of the board is reversed.

Reversed.

1 . Consisting of Examiners-in-Chief Magil and Lidoff, the latter writing the opinion, and Acting Examiner-in-Chief Behrens.

2 . See, for example, In re Crounse, 363 F.2d 881, 53 CCPA -; In re Legator, 352 F.2d 377, 53 CCPA -; In re DeMontmollin, 344 F.2d 976, 52 CCPA 1287; In re Graf, 343 F.2d 774, 52 CCPA 1206; In re Lohr, 317 F.2d 388, 50 CCPA 1274, 137 USPQ 548; In re Papesch, 315 F.2d 381, 50 CCPA 1084; and cases there cited.

We note, in this regard, an address by the Commissioner of Patents before the Patent Professional Staff of the Patent Office on MArch 30, 1966, 825 O.G. 825 (April 19, 1966), wherein it was said:

* * * if the examiner is satisfied that the claimed invention is clearly obvious in view of the teachings of the prior art, to a person having ordinary skill in the pertinent art, then a patent should not be granted even if affidavits, terminal disclaimers, and the like are presented by the applicant, since such papers cannot change what is obvious so it may become unobvious and therefore a patentable invention. The Supreme Court, however, points out that commercial success, long felt but unsolved needs, failure of others, etc., may have relevancy as indicia of obviousness or unobviousness, but they are of secondary importance. These factors may be helpful in resolving the question of obviousness or unobviousness in doubtful cases, since in each case where this question is pertinent, the examiner must resolve this question one way or the other to Ms satisfaction. [Second emphasis ours.]

We are familiar with the views of the Supreme Court there referred to as expressed in Graham v. John Deere Co., 383 U.S. 1, 86 S.Ct. 684, 15 L.Ed.2d 545, and United States v. Adams, 383 U.S. 39, 86 S.Ct. 708, 15 L.Ed.2d 572. In our view the Court there said nothing at all about “doubtful cases,” nor in any way suggested that any record evidence should not be accorded its full probative weight in particular situations, such as where the examiner “is satisfied” the prior art makes the invention “clearly obvious.” Such an approach is reminiscent of the proverbial “don’t bother me with the facts, my mind is made up” method of decision and has, we think, no place in the application of 35 U.S.C. § 103. We therefore remain of the view that the law requires consideration of all evidence, properly submitted, bearing on the question of obviousness.

Further, we do not understand the Commissioner’s attempt to relate terminal disclaimers to rejections based on section 103. See, in this regard, In re Bowers and Orr, 359 F.2d 886, 53 CCPA-.

3 . The board also relied upon both of these cases, and the examiner relied upon Ex parte Appeal No. 13,231 only. That board opinion was not published and was apparently unavailable to appellant except in its abstracted form appearing in 30 JPOS (January, 1948). We find it unnecessary to resolve a dispute over the propriety of relying on that case as precedent since, as we view the case before us, our decision is controlled by law in this court.