Minnesota Mining & Mfg. Co. v. International Plastic Corp.

159 F.2d 554, 72 U.S.P.Q. (BNA) 97, 1947 U.S. App. LEXIS 3799
CourtCourt of Appeals for the Seventh Circuit
DecidedJanuary 9, 1947
Docket8926, 9093-9095
StatusPublished
Cited by28 cases

This text of 159 F.2d 554 (Minnesota Mining & Mfg. Co. v. International Plastic Corp.) is published on Counsel Stack Legal Research, covering Court of Appeals for the Seventh Circuit primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
Minnesota Mining & Mfg. Co. v. International Plastic Corp., 159 F.2d 554, 72 U.S.P.Q. (BNA) 97, 1947 U.S. App. LEXIS 3799 (7th Cir. 1947).

Opinion

SPARKS, Circuit Judge.

These four appeals were argued at the same lime before this court. With the exception of Cause No. 9093, all involve appeals from judgments of validity and infringement in plaintiff’s suits for infringement of its patent to Drew, No. 2,177,627. No. 9093 is the appeal of the plaintiff from dismissal of its suit against the manufacturer of devices alleged to infringe, on jurisdictional grounds.

In cause No. 8926, plaintiff charged defendants with infringement of claims 4, 5, 6, 8, 10, 11, 15, and 16 of the patent, issued October 31, 1939, on an application filed June 10, 1933. No separate or distinct infringement was charged or found against the individual defendant, and all parties presenting the issues in the case refer to both appellants collectively as “the defend-dant.” We shall do the same.

The nature of the alleged invention is specifically described in the specifications in the following language:

“This invention relates to adhesive sheets having a backing with a non-fibrous surface (such as normal or waterproofed films of regenerated cellulose) and a coating of normally tacky and pressure-sensitive adhesive united thereto. While not limited thereto, the invention relates especially to transparent adhesive sheets, to adhesive sheets in the form of adhesive tapes which may be sold in stacked or coiled form, and to adhesive sheets or tapes which are well adapted to the sealing or securing of wrappers composed of non-fibrous lustrous cellu-losic films and the like.”

*556 Claim 4 is typical of claims 5, 6, 8, and 15, and claim 10 is typical of claims 11 and 16. 1

The difference between the typical claims lies in the fact that the interposed transparent primer mentioned in claim 10 and its types is not specifically mentioned in claim 4 and its types. Since the adhesive is more cohesive than it is adhesive with respect to the non-fibrous cellulosic film, defendant contends that plaintiff uses the primer in order that the adhesive may be more firmly and sufficiently united to the cellophane. Hence, defendant urges that while the primer is not specifically mentioned in claim 4 and its types, it must of necessity be implied therein from the use of the words “said adhesive being firmly united to said backing.” Under the evidence submitted, this conclusion does not follow. The examiner was of the same opinion, and it is not denied that plaintiff made and sold the product with and without the primer. True, plaintiff no doubt prefers the primer, but the claims cover both, and they are entitled to protection.

The accused tapes differ from claim 10 of the patent in two respects, and from claim 4 in one respect. They use no primer between the adhesive and the top surface of the film. The base of the cellophane film is coated with a film of organic material, which defendant characterizes as a repellent to the adhesive, on an overlying layer of the tape which serves to permit the tape to be unwound and to prevent offsetting of the adhesive on the back of the tape when it is unrolléd. The defendant’s adhesives vary in its different tapes, but in all cases they contain a larger percentage of resin or tack-producing agent than the one to two resin-rubber ratio specified in the patent. This is a difference of degree and not of kind.

The elements involved in the patent are quite old. The straight unmoistureproofed cellophane was in widespread use in 1913. Rubber-resin adhesives were used in the manufacture of shoes as early as 1905, and non-fibrous films were known and used in the photographic art in the last century. Such adhesive was well known to have a four-fold balance of adhesion, cohesion, stretchiness and elasticity, and yet prior to the disclosures of the patent, the thought prevailed that tacky rubber-resin adhesives, and the like, must be coated on cloth or paper tape backings in order to have a mechanical anchorage with a fibrous surface and a greater area of contact. That prevailing thought was proved to be erroneous by the disclosures of this patent, which taught that such adhesive will firmly bond to a smooth film backing, such as cellophane, even without an interposed primer, and yet the tape can be stripped from smooth surfaces without delamination of the tape or offsetting of the adhesive. This is due to the fact that the cohesive characteristic of such rubber-resin adhesive exceeds its adhesive characteristic.

Defendant admits that it uses the same adhesive with a higher percentage of resin than does plaintiff. It also uses a repellent 2 on the back of the film which merely decreases the adhesiveness of the top of the adhesive to the back of the film when wound for marketing. This no doubt accounts for the fact, which defendant stresses, that the accused tape unrolls with less effort than plaintiff’s. This of itself would not be suffi *557 cient to differentiate defendant’s product from the teachings of the patent. It might be considered as an improvement, but if so, that fact would not avoid infringement.

Furthermore, this record discloses that tests of the accused product or method, without the use of the repellent, and that of the patent without the use of the primer, produced practically identical and successful results as taught by the disclosures of the patent. This is rather convincing that defendant’s adhesives are the same, function the same, and secure the same results in the same way as the Drew adhesives, and that defendant’s “repellent” is not essential to its tapes.

It is contended by defendant, however, that inasmuch as it - does not use an inside “primer,” but uses a backside “repellent” it can not be said that appellant infringes claims 10, 11 and 16. We think that in each case the use of the two-layer structure of cellulosic film and inside primer or backside repellent produces substantially the same result in substantially the same way by substantially the same means. In each case the result is to increase the factor of safety as compared to tape in which the inside primer, or backside repellent is omitted. This conclusion seems to be rather well supported by the concessions of defendant’s expert, Whitby. We are convinced that defendant’s repellent represents a mere inversion of plaintiff’s use of its primer. In each case the adhesive is coated on a surface which has a higher specific adhesion toward it than has the back surface on the tape which is contacted when the tape is wound in a roll. For this reason we think each of the claims in issue is infringed as alleged.

Defendant contends that the patent is invalid because it is anticipated by prior public use. In this respect it stresses United States patents No. 1,850,760 to Mautell, and No. 1,760,820 to Drew. The former pertains to a method and means for shading and tracing designs such as pictures, portraits, photographic negatives, tracings and other transparencies and all similar things made by hand or otherwise which are susceptible of being shaded. Its obj-ect was to provide a service to commercial artists, who had been using frisket paper and shading films to be attached temporarily to drawings and the like as an aid in processing them for reproduction by photography and printing.

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Bluebook (online)
159 F.2d 554, 72 U.S.P.Q. (BNA) 97, 1947 U.S. App. LEXIS 3799, Counsel Stack Legal Research, https://law.counselstack.com/opinion/minnesota-mining-mfg-co-v-international-plastic-corp-ca7-1947.