The Supreme Court on Tuesday issued its opinion in Minerva Surgical Inc. v. Hologic Inc. The case sought to abolish the doctrine of patent assignor estoppel, which prohibits an inventor from ...

Addressing the applicability of assignor estoppel to inter partes review (IPR) proceedings, the US Court of Appeals for the Federal Circuit found that Congress’ intent was clear: assignor estoppel ...

“The status of the status quo is far from clear…. The Supreme Court has considered the applicability of assignor estoppel in only a handful of cases—none of them recent—and those precedents don’t ...

Based upon recent case pronouncements by both New York's highest court and federal courts, the doctrine of promissory estoppel should be invoked with selectivity, particularly when used to undermine ...

In his Patent and Trademark Law column, Rob Maier discusses the recent Supreme Court case 'Minerva Surgical v. Hologic,' and writes that "while the court rejuvenated the aging doctrine, it also ...

“’It is time for this court to consider en banc the doctrine of assignor estoppel as it applies both in district court and in the Patent Office’ in order to clarify this ‘odd and seemingly illogical ...

March 20, 2025 - In February 2025, the U.S. Court of Appeals for the Federal Circuit clarified when collateral estoppel might apply in a district court case following an invalidity determination by ...

July 10, 2025 - Patent Trial and Appeal Board (PTAB) post-grant validity challenges — for example, inter partes review — are frequent components of a patent litigation strategy for defendants.

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The Supreme Court on Tuesday narrowed the doctrine of patent assignor estoppel, which prohibits an inventor from assigning a patent to someone and then later contending in litigation that the patent ...