News & Analysis as of

Patent Infringement Collateral Estoppel Appellate Courts

Patterson Belknap Webb & Tyler LLP

If at First You Don’t Succeed, Do Not Try Again: Judge Oetken Invokes Collateral Estoppel to Dismiss Plaintiff’s Infringement...

On July 9, 2025, Judge J. Paul Oetken (S.D.N.Y) found that collateral estoppel barred plaintiff Linfo IP, LLC from relitigating the validity of its asserted patent and dismissed Linfo’s infringement claims against Aero...more

Jones Day

Federal Circuit Reverses District Court’s Application Of Collateral Estoppel

Jones Day on

Kroy IP Holdings, LLC sued Groupon, Inc., alleging infringement of 13 claims of U.S. Patent No. 6,061,660 (“’660 patent’), which relates to incentive programs over computer networks. Those claims were invalidated via...more

McDermott Will & Emery

Collateral Estoppel Doesn’t Apply to Unchallenged IPR Claims

McDermott Will & Emery on

The US Court Appeals for the Federal Circuit found that despite a Patent Trial & Appeal Board determination that certain challenged patent claims were unpatentable based on a preponderance of the evidence standard, the patent...more

Fox Rothschild LLP

Judge Andrews Denies Plaintiff’s Motion To Reconsider Prior Order Dismissing All Counts Of Complaint With Prejudice

Fox Rothschild LLP on

By Memorandum Order entered by The Honorable Richard G. Andrews in Dr. Laskhmi Arunachalam v. Citigroup Inc. et al., Civil Action No. 14-373-RGA (D.Del. December 4, 2020), the Court denied the motion of plaintiff to...more

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