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Circuit Clarifies Doctrine Of Equivalents Ruling

By Ron Zapata ( July 6, 2007, 12:00 AM EDT) -- In a precedent-setting case over when a patent owner could claim infringement under the doctrine of equivalents, the Federal Circuit ruled Thursday that SMC Corp. did not infringe a Festo Corp. patent for rodless cylinders because SMC's device was foreseeable and prosecution history estoppel applied....

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