(December 19, 2023, 12:53 PM EST) -- WASHINGTON, D.C. — The Federal Circuit U.S. Court of Appeals on Dec. 19 dismissed an appeal by a petitioner who failed to persuade the Patent Trial and Appeal Board to cancel various claims of a hairbrush patent, citing a dismissal with prejudice of an allegation of infringement of the patent and a failure by the appellant to establish that it is at risk of incurring future infringement liability....