News & Analysis as of

CAFC Prosecution History Estoppel Patents

Morrison & Foerster LLP

Federal Circuit Pushes Back on Prosecution Laches

In October 2023, we reported on the district court decision in Sonos, Inc. v. Google LLC. The decision was notable for reviving the prosecution laches doctrine to render unenforceable a continuation patent filed 13 years...more

Hudnell Law Group

Federal Circuit Rejects Formalistic Shield to Prosecution History Estoppel

Hudnell Law Group on

On July 18, 2025, the U.S. Court of Appeals for the Federal Circuit reversed a $106 million jury verdict in Colibri Heart Valve LLC v. Medtronic CoreValve, LLC, No. 2023-2153, finding that Colibri’s infringement claim under...more

Womble Bond Dickinson

Reminder: “Consisting essentially of” Is U.S. Patent Claim Language Needing Interpretation

Womble Bond Dickinson on

On June 30, 2025, the Federal Circuit issued a precedential opinion in Eye Therapies v. Slayback Pharma in which the court interpreted the transition phrase “consisting essentially of” to be a closed term excluding other...more

Cooley LLP

Federal Circuit Strengthens Prosecution History Estoppel Principles in Colibri Heart Valve LLC v. Medtronic CoreValve, LLC

Cooley LLP on

On July 18, 2025, the US Court of Appeals for the Federal Circuit reversed a lower court ruling in Colibri Heart Valve LLC v. Medtronic CoreValve, LLC, holding that prosecution history estoppel barred the patentees’ doctrine...more

Proskauer - The Patent Playbook

Eyes Open to the Past: Federal Circuit Holds Prosecution History Is Claim Construction Evidence

The Federal Circuit’s decision in Eye Therapies, LLC v. Slayback Pharma, LLC provides further insight into the tools available for patent claim construction. The Federal Circuit had previously held that a patent’s...more

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