( January 13, 2026, 12:54 PM EST) -- WASHINGTON, D.C. — The U.S. Patent and Trademark Office (PTO) designated as precedential four discretionary decisions issued last summer concerning when to approve or deny petitions for inter partes review (IPR) or post-grant review (PGR); among the findings now designated precedential is the advice that petitions from “time-barred parties should proceed only in exceptional circumstances.”...