SEATTLE–(BUSINESS WIRE)–TwinStrand Biosciences (TwinStrand), the pioneer in Duplex Sequencing® technology, today announced that the U.S. Patent and Trademark Office’s Patent Trial and Appeal Board (PTAB) has again rejected Guardant Health, Inc.’s (Nasdaq: GH) challenge to a core patent underlying Duplex Sequencing. In an Oct. 14, 2026, Final Written Decision on remand from the U.S. Court of Appeals for the Federal Circuit, the PTAB ruled in favor of the University of Washington (UW), determin
