On April 24, 2018 Enzo Biochem, Inc. (NYSE: ENZ) and its subsidiary Enzo Life Sciences, Inc. reported that the Patent Trial and Appeal Board has denied a petition filed by Hologic, Inc. (Nasdaq: HOLX) for inter partes review, a procedure for challenging the validity of patent claims, against U.S. Patent 6,221,581. Enzo Life Sciences, Inc. is asserting U.S. Patent 6,221,581 in patent infringement litigation against Hologic, Inc., Grifols Diagnostic Solutions, Inc., and Grifols S.A. in the U.S. District Court for the District of Delaware (Press release, Enzo Biochem, APR 24, 2018, View Source [SID1234525631]).
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