Estoppel Doctrine in China's Patent System
In a precedential opinion entered on May 7, 2025, the United States Court of Appeals for the Federal Circuit affirmed a jury verdict invalidating claims of two patents for anticipation and obviousness over the prior art....more
The Federal Circuit recently resolved a split among the district courts whether patent infringement defendants who bring inter partes review (IPR) challenges are estopped from raising new prior art challenges in a co-pending...more
Recently, an ITC Administrative Law Judge applied IPR statutory estoppel under 35 U.S.C. § 315(e)(2) in denying a Respondent’s motion for summary determination of invalidity in Certain Audio Players and Components Thereof,...more
In a significant development for patent litigants, the Federal Circuit in Ingenico Inc. v. IOENGINE, LLC, affirmed an important limitation on the scope of IPR estoppel under 35 U.S.C. § 315(e)(2). Specifically, the court held...more
Estoppel certification in reexamination prevents relitigation of resolved issues....more
This Federal Circuit Opinion analyzes statutory estoppel under 35 U.S.C. § 315(e)(1) and examines offensive and defensive arguments related to § 103 obviousness. Gesture Technology Partners, LLC is the owner of U.S....more
Presidio Components, Inc. (“Presidio”) petitioned for inter partes review (IPR) of U.S. Patent No. 6,144,547 (the “‘547 Patent”), which American Technical Ceramics Corp. and AVX Corporation (together “plaintiffs”) asserted...more