Energizer Holdings, Inc. and Eveready Battery Company, Inc. (collectively "EBC") appeal the ruling of the International Trade Commission in an action under section 337 of the Tariff Act of 1930 as amended (19 U.S.C. §1337), holding all of the claims of EBC's United States Patent No. 5,464,709 ("the '709 Patent") invalid for failure to comply with 35 U.S.C. §112 ¶2.1 We reverse the holding of invalidity and remand for further proceedings.