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IP News

By George Soussou and Jeff Ginsberg
November 01, 2019

More Than a Recitation of Hooke's Law Needed for Patent Protection

On Oct. 3, 2019, a Federal Circuit panel of Judges Dyk, Moore, and Taranto issued a decision in American Axle & Manufacturing, Inc. v. Neapco Holdings LLC, No. 2018-1763 (Fed. Cir. 2019). Judges Dyk and Taranto filed the majority opinion, and Judge Moore filed a dissenting opinion. The Federal Circuit affirmed the decision of the United States District Court for the District of Delaware, finding that the claims of U.S. Patent No. 7,774,911 ("the '911 patent") were unpatentable under 35 U.S.C. §101.

American Axle & Manufacturing, Inc. (AAM) sued Neapco Holdings LLC and Neapco Drivelines LLC (collectively, Neapco) for infringement of the '911 patent. See, id. at 2. The '911 patent is generally directed to "a method for manufacturing driveline propeller shafts ("propshafts") with liners that are designed to 'attenuat[e] … vibrations transmitted through a shaft assembly.'" Id. at 3 (citing '911 patent, col. 1, ll. 6-7). The vibrations of a propshaft cause undesirable noise, and various prior art references attempted to dampen the vibrations. See, id. at 3-4.

AAM argued that the inventive concept of the '911 patent was "the tuning of a liner in order to produce frequencies that dampen both the shell mode and bending mode vibrations simultaneously." Id. at 6. However, "neither the claims nor the specification describes how to achieve such tuning" and "does not discuss the process by which that liner was tuned." Id. at 7.

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