Federal Circuit: PTAB Decision of Invalidity Cannot Estop District Court Litigation on Different Claims from the Same Patent, Even When the Claims are Patentably Indistinct
April 23, 2025 Federal Circuit, Inter Partes Review, Patent Litigation
The Federal Circuit recently refused to apply collateral estoppel to claims of a patent asserted in district court litigation based on a Patent Trial and Appeal Board (PTAB) decision finding similar claims from the same patent unpatentable because the PTAB applied a lower burden of proof than what is required to invalidate claims in district court.
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