SRAM Corp. v. AD-II Engineering, Inc.

Opinion

BRYSON, Circuit Judge.

AD-II Engineering, Inc., appeals from a judgment of the United States District Court for the Northern District of Illinois holding that it infringed United States Patent No. 5,662,000 (“the ’000 patent”) owned by SRAM Corporation. SRAM Corp. v. AD-II Eng’g, Inc., 252 F.Supp.2d 712 (N.D.Ill.2003). We hold that during the prosecution of the ’000 patent SRAM disclaimed patent protection for certain features that are found in AD-II’s accused device. We therefore reverse the judgment of infringement.

The ’000 patent, entitled “Detent Spring for Rotatable Actuating…