Utility Patent Cases
Coverage since November 3, 1994

Utility Patent

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Gart v. Logitech, Inc. — Preferred Embodiment’s Specific Structure Cannot Limit Broader Claim Language; Patent Notice Letters Must Identify Specific Products

The Federal Circuit vacated summary judgment of non-infringement, holding that the district court improperly imported a structural limitation (a “ledge”) from the patent drawings into a broader claim term (“angular medial surface”), and clarified when a patentee’s pre-s

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Festo Corp. v. Shoketsu Kinzoku Kogyo Kabushiki Co. — En Banc Federal Circuit Creates Complete Bar to Doctrine of Equivalents After Claim Amendment

The Federal Circuit sitting en banc adopted a sweeping complete-bar rule: any narrowing amendment made during prosecution to comply with the Patent Act creates an absolute estoppel that bars all claims of equivalence for the amended element — a rule later rejected by the Supreme Court in 2002.

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