Ironburg Inventions Ltd. v. Valve Corporation, No. 24-2088 (Fed. Cir. June 18, 2026)

From the Opinion

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Valve Corporation appeals from a supplemental partial judgment of the United States District Court for the West- ern District of Washington . The district court ruled that Valve was estopped under 35 U.S.C. § 315(e)(2) from as- serting two invalidity grounds , which had not been in- cluded in a 2016 petition for inter partes review , against several claims of U.S. Patent No. 8,641,525.