Legal Insights

< back to search results

Assignor estoppel remains unavailable as an inter partes review (IPR) defense


The Board's recent Final Written Decision in Arista Networks, Inc. v. Cisco Systems, Inc., Case IPR2016-00303, confirms that assignor estoppel remains unavailable to patent owners.

Assignor estoppel is an equitable remedy that prohibits a patent assignor, or one in privity with an assignor, from later challenging the validity of an assigned patent.

Categories related to USA