Supreme Court Urged To Rein In Use Of Assignor Estoppel

Law360 (March 2, 2021, 8:19 PM EST) -- The federal government and several intellectual property law groups have urged the U.S. Supreme Court to limit the doctrine of assignor estoppel, which bars those who sell or assign patents to others from challenging their validity, saying it is used too often.

Numerous amicus briefs criticizing the doctrine and saying its application should be restricted were filed Monday in a case known as Minerva Surgical Inc. v. Hologic Inc., which the justices agreed to hear in January. However, many of the briefs didn't go as far as petitioner Minerva, which was barred by assignor estoppel from challenging a Hologic medical treatment...

Stay ahead of the curve

In the legal profession, information is the key to success. You have to know what’s happening with clients, competitors, practice areas, and industries. Law360 provides the intelligence you need to remain an expert and beat the competition.


  • Access to case data within articles (numbers, filings, courts, nature of suit, and more.)
  • Access to attached documents such as briefs, petitions, complaints, decisions, motions, etc.
  • Create custom alerts for specific article and case topics and so much more!

TRY LAW360 FREE FOR SEVEN DAYS

Hello! I'm Law360's automated support bot.

How can I help you today?

For example, you can type:
  • I forgot my password
  • I took a free trial but didn't get a verification email
  • How do I sign up for a newsletter?
Ask a question!