Biotec Biologische Naturverpackungen Gmbh & Co. Kg, Plaintiff-Cross v. Biocorp, Inc. And Novamont, S.P.A.

249 F.3d 1341, 58 U.S.P.Q. 2d (BNA) 1737, 2001 U.S. App. LEXIS 9218
CourtCourt of Appeals for the Federal Circuit
DecidedMay 14, 2001
Docket99-1578, 00-1093 and 00-1094
StatusPublished
Cited by99 cases

This text of 249 F.3d 1341 (Biotec Biologische Naturverpackungen Gmbh & Co. Kg, Plaintiff-Cross v. Biocorp, Inc. And Novamont, S.P.A.) is published on Counsel Stack Legal Research, covering Court of Appeals for the Federal Circuit primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
Biotec Biologische Naturverpackungen Gmbh & Co. Kg, Plaintiff-Cross v. Biocorp, Inc. And Novamont, S.P.A., 249 F.3d 1341, 58 U.S.P.Q. 2d (BNA) 1737, 2001 U.S. App. LEXIS 9218 (Fed. Cir. 2001).

Opinion

PAULINE NEWMAN, Circuit Judge.

Biocorp, Inc. and Novamont S.p.A. (together “defendants”) appeal the judgment of the United States District Court for the Central District of California, 1 entered upon a jury verdict that certain biodegradable starch-based products infringe United States Patents Nos. 5,362,777 (the '777 patent) and 5,280,055 (the '055 patent). The patents are owned by Biotec Biolo-gische Naturverpackungen GmbH, and cover certain inventions of Dr. Ivan Tomka relating to a product called “thermoplasti-cally processable starch” (TPS). According to these inventions starch such as that of wheat, potatoes, or corn is modified to produce TPS, a biodegradable polymeric material that can be shaped into plastic-type articles by standard thermoplastic processing techniques, typically injection molding or extrusion. The patented product is described as an important improvement on prior starch-based plastics, a witness calling the Tomka TPS “a landmark in starch polymer material.”

Biotec charged the defendants with infringement and inducing infringement of the '777 and '055 patents, based on Nova-mont’s production in Italy of starch-based polymeric products and their importation and sale by the defendants in the United States. The defendants responded that the Biotec patents are not infringed, are invalid, and are unenforceable. On motions for summary judgment the district court decided the issues of validity and enforceability in Biotec’s favor. The issues of infringement were tried to a jury, which found the defendants liable for infringement or inducement of infringement, but not willful infringement. The jury awarded compensatory damages, assessing $750,000 against Novamont and $250,000 *1345 against Biocorp. The district court entered the judgment, enjoined further infringement, and denied the duly made post-trial motions. This appeal followed. Biotec cross-appeals the judgment that the infringement was not willful.

THE INVENTIONS

It was known to make plastic-forming starch, called “destructurized starch,” by swelling and kneading native starch at elevated temperatures to produce a thermo-mechanically transformed starch. This procedure was conducted in the presence of added water, for native starch, which contains 10-20% water, chars at the high temperatures needed to transform the starch. However, the resultant high water content is disadvantageous for further processing using standard plastic-forming equipment and temperature conditions, for the water foams as steam and leaves undesirable bubbles in the final plastic product.

To solve this problem, the thermoplasti-cally processable starch of the '777 patent is produced by preparing destructurized starch without added water, instead conducting the destructurizing transformation in the presence of a plasticizer or other additive, thereby lowering the melting point of the composition. According to the '777 patent the starch/additive composition is melted at a temperature below the decomposition temperature of the starch, and mixed until the product is substantially free of water and the crystalline content is reduced to below 5%. Crystalline content is a measure of the mechanical transformation of the starch, and the removal of water from the product eliminates the disadvantageous foaming and bubbling during further plastic processing.

Claims 1 and 20 are representative of the claims in suit of the '777 patent, with emphases added to terms that were construed in connection with the charges of infringement:

1. A method of preparing thermoplas-tically processable starch which is a substantially water free combination of starch with at least one additive, the method comprising admixing starch with at least 5 weight percent based on the weight of the mixture of at least one additive, said additive being such that it reduces the melting point of the starch in the mixture to below the decomposition temperature of the starch, said additive having a solubility parameter of more than 15 cal2 cm2/3> said additive having a vapor pressure of less than 1 bar in said mixture at a temperature of about the melting point of said mixture, and melting and mixing said admixture until it is substantially water free and until the crystalline content is less than 5%.
20. A thermoplastically processable starch comprising a substantially water free, homogeneous mixture having a crystalline content of less than 5% of starch and at least 5 weight % of at least one additive having a solubility parameter of more than 15 cal2 em2/3, said additive having a vapor pressure in the mixture of less than +1 bar at about the melting point of the homogeneous mixture, and the melting point of the mixture being lower than the decomposition temperature of the starch.

The ’055 patent is directed to an interactive blend of the thermoplastically processable starch of the '777 patent, a cellulose derivative, and a phasing agent. The product of the '055 patent is described as having advantageous resistance to moisture and to be more readily processed in standard plastic molding machinery. Claim 1 is the broadest claim:

1. Biodegradable mould ■ material or polymer blend with a high resistance to moisture, containing at least thermoplas-tically processable starch and a cellulose *1346 derivative and 5-25% by volume of a phasing agent, which by physical interaction or chemical reaction or both with the cellulose derivative phase and the phase of the thermoplastieally processable starch makes it possible to improve the adhesion of both phases.

Neither side argues the '055 patent separately. Thus its fate accompanies that of the '777 patent.

The evidence and argument relating to the meaning and scope of the claims were presented at trial, in the presence of the jury. The district court construed the disputed claim terms in the court’s instructions to the jury. The defendants argue that the district court incorrectly construed the terms “substantially water free,” “thermoplastieally processable starch,” and “crystalline content.” They state that on the correct construction of these terms no reasonable jury could have found infringement of these patents. The district court, however, sustained the verdict.

“Substantially Water Free”

The district court instructed the jury that “substantially water free” means that “the resulting mixture has a total water content of less than 5%, as measured by dividing the weight of the water in the resulting mixture by the weight of the starch, water, and additives.” The defendants argue that the prosecution history requires not simply less than 5% water content, but substantially less than 5%, pointing to various statements in the prosecution history discussing a water content of 1% or 3%. The defendants state that a 3% limit would exclude all or most of the Novamont production.

The term “substantially water free” is not given a numerical limit in the specification of the '111 patent. The term was explained during prosecution as distinguishing the water content of the '111 product from that produced in the cited reference to Lay.

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249 F.3d 1341, 58 U.S.P.Q. 2d (BNA) 1737, 2001 U.S. App. LEXIS 9218, Counsel Stack Legal Research, https://law.counselstack.com/opinion/biotec-biologische-naturverpackungen-gmbh-co-kg-plaintiff-cross-v-cafc-2001.