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"Critical" ratio in claim does not get the benefit of the doctrine of equivalents
January 19, 2007

    Today's lesson from the Federal Circuit: be careful not to make a claim limitation "critical," or you may lose the benefit of the doctrine of equivalents for that element. The court found that the claimed weight ratio of two drugs was critical in part because other claims recited a range of ratios, but the claim at issue simply recited a specific ratio, "about 1:5." The court stated that permitting infringement....... Read More


    Showing a strong Spine, the Federal Circuit addresses the Doctrine of Equivalents
    November 21, 2006

      In DuPuy Spin, Inc. v. Medtronic Sofamor Danek, Inc., the Federal Circuit concluded that the district court erred in granting summary judgment of non-infringement on Medtronics Vertex? model with regards to U.S. Patent No. 5,207,678 (the '678 patent). Additionally, the Federal Circuit concluded that the district court's judgment of non-infringement for Medtronics bottom-loaded screw device was proper and that the....... Read More


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