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Equivalent not tangentially related to amendment, doctrine of equivalents unavailable
March 20, 2007

    In a case coming before the Federal Circuit for the second time, the court reversed a finding of infringement under the doctrine of equivalents because of prosecution history estoppel. The court rejected the patentee's argument that the amendment was only tangentially related to the equivalent, thus the Festo presumption of surrender of equivalents was not rebutted, and not infringement was found. Judge Rade....... Read More


    Comparison of Commercial Products not the vehicle to analyze equivalence
    February 27, 2007

      In a second appearance before the Federal Circuit, AquaTex again appealed a decision of the District Court that Techniche Solutions' Cooling Apparel did not infringe their U.S. Patent No. 6,371,977 for a protective multi-layered liquid retaining composition. The Federal Circuit had previously affirmed the lower court's finding of no literal infringement while remanding the case back to the District Court for furt....... Read More


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