PTAB: Unidirectional Language of AIA Estoppel Dooms Common-Law Claim Preclusion Argument Based on District Court’s Final Judgment of No Invalidity

The Patent Trial and Appeal Board has rejected a patent owner's request to end an inter partes review, stating that the one-sided nature of estoppel under 35 U.S.C. § 315(e) prevents common-law claim preclusion from being used as a reason for termination.

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