News & Analysis as of

Prosecution History Estoppel Patents

Schwabe, Williamson & Wyatt PC

Latest Federal Court Cases: Top Brand LLC v. Cozy Comfort Company LLC

Top Brand LLC v. Cozy Comfort Company LLC, Appeal No. 2024-2191 (Fed. Cir. July 17, 2025) In this week’s Case of the Week, the Court of Appeals for the Federal Circuit held that prosecution history disclaimer applies to...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

BCLP

Federal Circuit Clarifies Limits of Prosecution Disclaimer in Patent Families

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In Maquet Cardiovascular LLC v. Abiomed Inc., 131 F.4th 1330 (Fed. Cir. 2025), the Federal Circuit addressed whether the prosecution history of one patent in a patent family can limit the scope of claims in a different patent...more

Robins Kaplan LLP

Allergan USA, Inc. v. Sun Pharm. Indus. Ltd.

Robins Kaplan LLP on

Case Name: Allergan USA, Inc. v. Sun Pharm. Indus. Ltd., No. CV 19-1727-RGA, 2022 WL 16921800 (D. Del. Nov. 14, 2022) (Andrews, J.) Drug Product and Patents-in-Suit: Viberzi® (eluxadoline); U.S. Patents Nos. 9,675,587 (“the...more

Akin Gump Strauss Hauer & Feld LLP

Cancellation of Independent Claims in IPR Does Not Estop Doctrine of Equivalents Arguments for Surviving Dependent Claims

A judge in the Eastern District of Virginia recently held that cancellation of independent claims in an inter partes review (IPR) did not preclude the plaintiff from asserting infringement based on the doctrine of equivalents...more

Robins Kaplan LLP

Almirall, LLC v. Torrent Pharms., Ltd.

Robins Kaplan LLP on

Case Name: Almirall, LLC v. Torrent Pharms., Ltd., Civ. No. 20-1373-LPS (D. Del. July 13, 2021) (Stark, J.) - Drug Product and Patent(s)-in-Suit: Aczone® Gel, 7.5% (Dapsone); U.S. Patent No. 9,517,219 (“the ’219 patent”)...more

McDonnell Boehnen Hulbert & Berghoff LLP

ToolGen Files Reply to CVC Opposition to ToolGen Substantive Motion No. 1

On July 15th, Junior Party the University of California/Berkeley, the University of Vienna, and Emmanuelle Charpentier (collectively, "CVC") filed its opposition to Senior Party ToolGen's Substantive Motion No. 1 for benefit...more

McDonnell Boehnen Hulbert & Berghoff LLP

Eli Lilly & Co. v. Apotex, Inc. (Fed. Cir. 2020)

After more than two decades of being the red-headed stepchild of patent infringement before the Federal Circuit, infringement under the doctrine of equivalents has made a dramatic comeback in the past few years, the Court...more

McDonnell Boehnen Hulbert & Berghoff LLP

Sherwin-Williams Co. v. PPG Industries, Inc. (W.D. Pa. 2020)

Earlier this month, in Sherwin-Williams Co. v. PPG Industries, Inc., Special Master Henry M. Sneath issued a Report and Recommendation in the U.S. District Court for the Western District of Pennsylvania that a motion by...more

Goodwin

ITC 337 Quarterly Insider Q2 2020

Goodwin on

Goodwin’s 337 Quarterly Insider remains the premiere publicly available source for keeping up to date on all meaningful decisions coming out of the Commission. Please find below Goodwin’s insights on the months of April, May,...more

McDonnell Boehnen Hulbert & Berghoff LLP

Supreme Court Denies Another Certiorari Petition on Doctrine of Equivalents

The Federal Circuit during 2019 and 2020 has issued a spate of decisions on the proper application of the Doctrine of Equivalents (see, e.g., UCB, Inc. v. Watson Laboratories Inc. and Galderma Laboratories, L.P. v. Amneal...more

Bradley Arant Boult Cummings LLP

The Dedication-Disclosure Rule: An Effective and Efficient Tool in the Defense Toolbox

The Federal Circuit has affirmed infringement under the doctrine of equivalents in a number of cases over the last few years. Briefly, the judicially created doctrine of equivalents is intended to expose those who adopt the...more

McDonnell Boehnen Hulbert & Berghoff LLP

Eagle Pharmaceuticals Inc. v. Slayback Pharma LLC (Fed. Cir. 2020)

Infringement under the doctrine of equivalents (as a basis of a successful cause of action having renewed vigor before the Federal Circuit recently (see, e.g., "Galderma Laboratories, L.P. v. Amneal Pharmaceuticals LLC") is...more

McDonnell Boehnen Hulbert & Berghoff LLP

DOE Infringers Petition for Certiorari over PHE "Tangential Relationship" Test

Recently, the Federal Circuit has taken up issues relating to infringement under the doctrine of equivalents (DOE) and a related doctrine, prosecution history estoppel (PHE), that limits the scope of equivalents that can be...more

Knobbe Martens

Examiner Amendments Can Trigger Prosecution History Estoppel

Knobbe Martens on

Amgen, Inc. v. Amneal Pharmas. LLC et al - Before Newman, Lourie, and Taranto.  Appeal from the U.S. District Court for the District of Delaware. Summary: An examiner amendment may give rise to prosecution history...more

Knobbe Martens

Prosecution History Estoppel Bars Infringement Claim Under Doctrine of Equivalents

Knobbe Martens on

PHARMA TECH SOLUTIONS, INC. v. LIFESCAN, INC. Before Moore, Reyna, and Stoll. Appeal from the United States District Court for the District of Nevada. Summary: Claims for infringement under the doctrine of equivalents...more

Sterne, Kessler, Goldstein & Fox P.L.L.C.

The Goods on IP - October 2019: Curver Luxembourg v. Home Expressions: Words Can Matter in a Design Patent

Claim construction for a design patent is mainly focused on the drawings, which show the ornamental design that is protected by the patent. But the Federal Circuit recently identified one situation where the drawings weren’t...more

McDermott Will & Emery

“Tangential Relation” Exception Saves Patentee’s Reliance on DOE

McDermott Will & Emery on

Addressing an infringement determination under the doctrine of equivalents (DOE), the US Court of Appeals for the Federal Circuit found that the “tangential relation” exception to the doctrine of prosecution history estoppel...more

Jones Day

Verbal Aspect of Claim Limits Design Patent Scope in Curver Luxembourg v. Home Expressions

Jones Day on

The Federal Circuit affirmed dismissal of design patent infringement claims under an estoppel theory triggered by amendments made to meet patentability requirements in Curver Luxembourg, SARL v. Home Expressions Inc., No....more

McDermott Will & Emery

Doctrine of Equivalents – It’s Over Before It Begins

The US Court of Appeals for the Federal Circuit affirmed a dismissal based on the defendant’s failure to state a claim motion, concluding that under principles of prosecution history estoppel, the patent owner could not...more

Cozen O'Connor

The Tangential Exception to the Presumption of Prosecution History Estoppel

Cozen O'Connor on

The Federal Circuit has consistently described the “tangential” exception to the presumption of prosecution history estoppel as “very narrow.” Only a few Federal Circuit decisions have found proof of the tangential exception...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

Federal Circuit Cautions Against Rigid Approach to Prosecution History Estoppel in Fourth Appeal from ALIMTA® Litigations

On August 9, 2019, the United States Court of Appeals for the Federal Circuit, in Eli Lilly & Co. v. Hospira, Inc., Nos. 2018-2126, 2127, 2128, reversed in-part and affirmed in-part a district court’s determination of...more

Mintz - Intellectual Property Viewpoints

Effect of Prosecution History Estoppel on Infringement Claim under Doctrine of Equivalents

The Federal Circuit in Amgen Inc. v. Coherus Biosciences Inc. affirmed a district court decision that once certain subject matter is clearly and unmistakably surrendered during prosecution, the patentee is barred from...more

Jones Day

ITC Rejects Sofa Design Patent Infringement On Prosecution History Estoppel Grounds

Jones Day on

While design patents follow many of the same rules as utility patents, the application of those rules in determining design patent infringement can be less than straightforward. But a recent Initial Determination by ALJ...more

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