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Patent Applications Doctrine of Equivalents Prosecution History Estoppel

McDonnell Boehnen Hulbert & Berghoff LLP

Colibri Heart Valve LLC v. Medtronic Corevalve, LLC (Fed. Cir. 2025)

The doctrine of equivalents (DOE), a creation of the Supreme Court in Graver Tank & Mfg. v. Linde Air Products (1950), is balanced by the concept of prosecution history estoppel (PHE), the contours of which were delineated...more

Knobbe Martens

The Tangential Exception to Prosecution History Estoppel

Knobbe Martens on

ELI LILLY AND COMPANY v. HOSPIRA, INC. Before Lourie, Moore, and Taranto. Appeal from the District Court for the Southern District of Indiana. Summary: A narrowing claim amendment does not necessarily surrender all...more

Mintz - Intellectual Property Viewpoints

Effect of A Restriction Requirement on Prosecution History Estoppel

The decision whether to issue a Restriction Requirement during patent prosecution lies with the patent examiner, not the patent applicant. A Restriction Requirement can nevertheless trigger prosecution history estoppel that...more

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