Legal Opinion
Regeneron Pharmaceuticals, Inc. v. Merus N.V.
Court of Appeals for the Federal Circuit
Decided July 27, 2017No. 2016-1346PublishedCited by 51 opinions
1Opinion of the Court
Dissenting opinion filed by Circuit Judge NEMWAN.
PROST, Chief Judge.
Regeneron Pharmaceuticals, Inc. (“Re-generon”) appeals from a final judgment of the district court holding U.S. Patent No. 8,502,018 (“’018 patent”) unenforceable because of Regeneron’s inequitable conduct during prosecution. Regeneron also appeals the district court’s construction of several claim terms and determination of indefiniteness. Because we conclude that Regeneron engaged in inequitable conduct during prosecution of the ’018 patent, we affirm.
I
In March 2014, Regeneron filed suit in the Southern District of New York…
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