AMGEN, INC. v. COHERUS BIOSCIENCES INC., decided July 29, 2019, Arguement-based Estoppel

U.S. Patent No. 8,273,707 is directed to purifying proteins using HIC (pages 2-3). In prosecution, the applicants argued that combination and a particular combination of salts is not taught in the prior art (pages 4-5). A declaration discussing the particular combination as being beneficial was submitted during prosecution (page 5). Due to argument-based prosecution history […]