( November 24, 2025, 8:21 AM EST) -- WASHINGTON, D.C. — A split Federal Circuit U.S. Court of Appeals panel affirmed the U.S. Patent Trial and Appeal Board’s (PTAB) decision to uphold the validity of a technology company’s patents on stylus-based inputs for mobile devices; the majority agreed with PTAB that Samsung Electronics Co. Ltd. and an affiliate improperly introduced a new obviousness theory in a reply during inter partes review (IPR)....