Pfizer filed a patent infringement action against Teva Pharmaceuticals (“Teva”) over a patent that claims the use of certain chemical compounds claimed as a method to treat erectile dysfunction. During the case, Teva filed a motion to amend its answer and counterclaims to alleged a defense and counterclaim for inequitable conduct. The district court granted the motion, but noted that it was a close case.
Several months later, Teva moved to amend its answer and counterclaim to change its allegations supporting the inequitable conduct claim. The district court denied the requested amendment on the ground of prejudice and futility because the amendment was late and would prejudice Pfizer and the individuals named in the proposed amendment and because the amendment failed to make any plausible showing of but-for materiality.
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