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United States Patent and Trademark Office › Appellate Courts › Patent Invalidity

The U.S. Patent and Trademark Office is an agency of the United States Department of Commerce that serves a fundamental role in the U.S. intellectual property system by issuing patents and registering trademarks.... more +
The U.S. Patent and Trademark Office is an agency of the United States Department of Commerce that serves a fundamental role in the U.S. intellectual property system by issuing patents and registering trademarks.    less -
A&O Shearman

Non-Application Of Interference Estoppel By PTAB In An IPR Institution Decision Found To Be Unreviewable

A&O Shearman on

On July 22, 2025, the Court of Appeals for the Federal Circuit concluded that the Patent Trial and Appeal Board’s (the “PTAB”) decision not to apply interference estoppel and, therefore, to institute an inter partes review...more

Warner Norcross + Judd

Federal Circuit Affirms the Use of ‘Secret’ Prior Art

Warner Norcross + Judd on

In a recent precedential opinion, the United States Court of Appeals for the Federal Circuit affirmed that a patent application constitutes prior art as of its filing date, not its publication date. In Lynk Labs. Inc. v....more

Bradley Arant Boult Cummings LLP

High Court to Review Whether Assignor Estoppel Prevents Assignor from Filing an IPR or Relying on a Prior Invalidity Decision

Bradley Arant Boult Cummings LLP on

Last spring in Hologic, Inc. v. Minerva Surgical, Inc., the Federal Circuit ruled that the doctrine of assignor estoppel does not prevent an assignor from lodging a validity challenge of either patent in an IPR proceeding. In...more

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