(September 4, 2015, 10:35 AM EDT) -- WASHINGTON, D.C. — A District of Columbia federal judge’s decision to uphold findings by the U.S. Patent and Trademark Office (PTO) that a patent covering rigid, gas permeable contact-lens materials is invalid as obvious was not clearly erroneous, the Federal Circuit U.S. Court of Appeals concluded Sept. 3 (Dome Patent LP v. Michelle K. Lee , Director, U.S. Patent and Trademark Office, No. 14-1673, Fed. Cir.)....