As a much younger attorney, I gave a presentation at the 1990 AIPLA Annual Meeting: “A Review of Recent Federal Circuit Decisions Relating to Infringement” (AIPLA Selected Legal Papers, 9, 3 (July 1991)), in which I wrestled with the question of whether or not a novel and unobvious chemical composition would infringe under the doctrine of equivalents. Since this is the central issue that the Supreme Court will be asked to resolve in Saint-Gobain Ceramics v. Siemens Med. Sol’ns, Supreme Ct. No. 11-301, I thought these excerpts might be of interest:
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“Although no recent case (or any case) was found where the unobviousness of a substituted ingredient led to a holding of non-infringement of an accused composition that otherwise met the tripartite test, such a holding would be appropriate. At the very least, Atlas Powder Co. v. DuPont DeNemours & Co., 750 F.2d 1569 (Fed. Cir. 1985), suggests that an unexpected result achieved by the accused composition would support a finding of non-interchangeability [and thus, noninfringement].
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