RADER, Circuit Judge.
Schering Corporation and Biogen, Inc. (collectively, Schering) sued Amgen Inc. in the United States District Court for the District of Delaware for infringing U.S. Patent No. 4,530,901 (the '901 patent). The '901 patent claims recombinant DNA molecules encoding specific types of human interferon, microorganisms genetically engineered to produce that interferon, and methods of producing interferon with recombinant technology. The district court...
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