( July 29, 2025, 12:19 PM EDT) -- WASHINGTON, D.C. — A Federal Circuit U.S. Court of Appeals panel said it saw no errors in the U.S. Patent Trial and Appeal Board’s (PTAB) finding that DocuSign Inc. successfully showed that all challenged claims in web security patents were unpatentable as obvious in three separate inter partes review (IPR) proceedings, rejecting the appellant inventor’s contention that PTAB’s findings stemmed from an incorrect claim construction....