( January 23, 2026, 9:49 AM EST) -- WASHINGTON, D.C. — A Federal Circuit U.S. Court of Appeals panel found that issue preclusion barred the U.S. Patent Trial and Appeal Board (PTAB) from adjudicating the validity of a patent claim in inter partes review (IPR) proceedings initiated by Apple Inc.; the panel reversed the PTAB’s finding that Apple failed to show that the patent claim was invalid as obvious....