Bon Tool Company (Bon Tool) appeals a final decision from the United States District Court for the Southern District of Texas. After a bench trial, the district court found that the Forest Group, Inc. (Forest) falsely marked its stilts with intent to deceive the public, and the district court fined Forest $500 for a single decision to falsely mark. The district court also determined that U.S. Patent No. 5,645,515 (the ’515 patent) was not invalid, that Bon Tool did not infringe the ’515 patent, and that Forest had not violated the Lanham Act. The court declined to find the case exceptional or award attorney fees. For the reasons set forth below, we affirm in part, vacate in part, and remand.