Medrad, Inc. appeals from a final judgment granting the motion of Tyco Healthcare Group LP, Mallinckrodt Inc., Liebel-Flarsheim Co., and Nemoto Kyorindo Co., Ltd. (collectively “Tyco”) for summary judgment of invalidity of U.S. Reissue Patent No. 37,602 (’602 reissue patent). Medrad, Inc. v. Tyco Healthcare Group, LP, 391 F. Supp. 2d 374 (W.D. Pa. 2005) (Case No. 01-CV-1997). Because we conclude that the defect that formed the basis for the ’602 reissue patent was within the plain meaning of 35 U.S.C. § 251, we reverse and remand.