January 19, 2021

Volume XI, Number 19

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January 19, 2021

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January 18, 2021

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Supreme Court to Consider Doctrine of Assignor Estoppel in Patent Cases

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.”

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© 2020 McDermott Will & EmeryNational Law Review, Volume XI, Number 14
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About this Author

Amol Parikh, McDermott Will Emery, Chicago, patent lawyer, Intellectual Property Litigation Attorney
Associate

Amol Parikh is an associate in the law firm of McDermott Will & Emery LLP and is based in the Firm's Chicago office.  He focuses his practice on IP litigation, counseling and prosecution. Amol has been recognized as a 2011 Illinois Rising Star in Intellectual Property by Law & Politics.  Rising Stars are lawyers under the age of 40 that have been in practice for 10 years or less.  No more than 2.5 percent of the lawyers in Illinois are named as Rising Stars.

Amol has...

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