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Collateral Estoppel Applied by District Court Following IPR on Similar Patents, PTAB Litigation Blog

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In Think Prod., Inc. v. ACCO Brands Corp., No. 18-CV-07506, 2019 WL 6609427, at *1 (N.D. Ill. Dec. 5, 2019), the District Court addressed whether the plaintiff patent ower was collaterally estopped from arguing validity in view of PTAB rulings, affirmed by the Federal Circuit, that invalidated two of the plaintiff’s similar patents.

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