( December 11, 2025, 9:57 AM EST) -- WASHINGTON, D.C. — In a dispute over a patent held by the International Business Machines Corp. related to single-sign-on (SSO) technology with Zillow Group Inc. and a related entity, a Federal Circuit U.S. Court of Appeals Panel affirmed U.S. Patent Trial and Appeal Board (PTAB) findings that some claims in the patent were invalid while others were not, rejecting arguments from both parties....