Patent Case Watch

Patent opinions from the Eastern District of Texas and the U.S. Court of Appeals for the Federal Circuit

Fed. Cir.

Amgen Inc. v. Coherus BioSciences Inc., No. 18-1993 (Fed. Cir. July 29, 2019)

Affirmed
Doctrine of Equivalents Prosecution History Estoppel Motion to Dismiss
Court
U.S. Court of Appeals for the Federal Circuit
Case No.
No. 18-1993
Decided
July 29, 2019
Judge
Stoll, J.
Document
Precedential Opinion
Length
12 pages

From the Opinion

The passage below is extracted verbatim from the opening of the document. It has not been editorially summarized — consult the full opinion for the court's complete reasoning.

Amgen Inc. and Amgen Manufacturing Ltd. (collec- tively, “Amgen”) sued Coherus Bio Sciences Inc. for patent infringement in the District of Delaware. The district court dismissed Amgen’s complaint for failure to state a claim , and Amgen appeals. Because prosecution history estoppel bars Amgen from succeeding on its infringement claim un- der the doctrine of equivalents , we affirm the order of the district court. BACKGROUND I Recombinant t herapeutic proteins are a class of bio- logic medicines that are manufactured inside living cells.

Download Opinion (PDF)

Source: govinfo.gov USCOURTS collection · retrieved July 23, 2026 · Report an error