Analysis

Fed. Circ. Puts PTAB Assignor Estoppel To Rest

Law360 (November 15, 2018, 8:57 PM EST) -- The Federal Circuit's ruling that inventors can challenge their own patents in inter partes review puts to rest the issue of assignor estoppel at the Patent Trial and Appeal Board, while illustrating the reach of the court's ruling in Wi-Fi One.

The appeals court in a Nov. 9 ruling held assignor estoppel, a doctrine that prevents former owners of a patent from challenging its validity, does not apply in IPR. The court said Arista Networks Inc. was able to bring an IPR against a Cisco Systems Inc. patent covering Ethernet switch products.

The decision, which marked the first time the Federal...

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!