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The Federal Circuit's Modern Doctrine of Equivalents in Patent Infringement
Gregory J. Smith
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Abstract
In November 1987, the Court of Appeals for the Federal Circuit decided Pennwalt Corp. v. Durand-Wayland, Inc.,' after rehearing the case en banc. 2 The Federal Circuit in Pennwalt, splitting seven to four, affirmed the district court's finding of no infringement.In doing so, the Pennwalt majority approved some rules of analysis under the doctrine of equivalents 3 that drew a sharp dissent from Judge Bennett, 4 a harsh criticism of the majority's
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