Supreme Court to Consider Doctrine of Assignor Estoppel in Patent Cases

By on January 14, 2021
Posted In Cert Alert, Patents

The Supreme Court of the United States agreed to review assignor estoppel in patent cases. Minerva Surgical, Inc. v. Hologic, Inc., et al., Case No. 20-440 (Supr. Ct. Jan. 8, 2021) (certiorari granted). The question presented is:

Whether a defendant in a patent infringement action who assigned the patent, or is in privity with an assignor of the patent, may have a defense of invalidity heard on the merits.

Csaba Truckai is the inventor of two patents relating to endometrial ablation that were ultimately acquired by Hologic. Truckai later founded Minerva and developed a system that competed with Hologic’s system. The district court ruled that Minerva could not challenge the validity of the patents because Truckai was barred by assignor estoppel from attacking his own patents. A jury found that Minerva infringed both patents and awarded Hologic more than $4.7 million. On appeal, the US Court of Appeals for the Federal Circuit affirmed, confirming that assignor estoppel bars an assignor from asserting invalidity of an assigned patent in district court, and “declined Minerva’s invitation to ‘abandon the doctrine’ of assignor estoppel entirely.”

Amol ParikhAmol Parikh
Amol Parikh concentrates his practice on intellectual property litigation, counseling and procurement. He draws on his trial and litigation experience in combination with his engineering training to quickly identify intellectual property issues and develop creative strategies to address them. Amol’s work on behalf of clients has earned him recognition in many industry publications. Most recently, Amol was recognized in February 2019 with the International Law Office’s “2019 Client Choice Award” for Intellectual Property in Illinois. The award recognizes “excellent client care” and the “ability to add real value to clients’ business above and beyond the other players in the market,” and winners may only be nominated by corporate counsel. Read Amol Parikh's full bio.

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