Federal Circuit Agrees That Argument-Based Prosecution Estoppel Barred Amgen from Succeeding on Infringement Claim

The Federal Circuit issued an opinion on July 29 affirming the District Court for the District of Delaware’s dismissal of Amgen Inc. and Amgen Manufacturing Ltd.’s (collectively, “Amgen”) complaint alleging infringement of U.S. Patent 8,273,707 (the “’707 Patent”) for failure to state a claim.  The district court held that prosecution history estoppel barred Amgen from succeeding on its infringement claim under the doctrine of equivalents.  Amgen Inc. v. Coherus BioSciences, Inc., No. 18-1993 (Fed Cir. July 29, 2019) (Before Reyna, Hughes, and Stoll, Circuit Judges) (Opinion for the Court, Stoll, Circuit Judge). 

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