Ring & Pinion Service Inc. v. ARB Corporation Ltd, No. 13-1238 (Fed. Cir. Feb. 19, 2014)

From the Opinion

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Defendant ARB Corporation Ltd. (ARB) appeals from the district court’s grant of summary judgment of non - infringement of U.S. Patent No. 5,591,098 (the ’098 p a- tent) to Ring & Pinion Service, Inc. (R&P). Because the district court erred by improperly applying the doctrine of claim vitiation, we reverse and remand with instructions to enter judgment of infringement for ARB. BACKGROUND The invention claimed in the ’098 patent is an i m- proved automobile locking differential. ’098 patent col. 1 l. 63–col. 2 l. 2.