The assignor of a patented network security logging device that “broadcast” network security threats was not estopped from initiating an inter partes review of the patent, the U.S. Court of Appeals for the Federal Circuit has determined. However, the court also ruled that the Patent Trial and Appeal Board, in invalidated some of the patent’s claims, rendered an interpretation of the term “broadcast” that was overly broad, and the court therefore reversed that decision and remanded the case (Arista Networks, Inc. v. Cisco Systems, Inc., November 9, 2018, Prost, S.).

A full summary of this case has been published on Kluwer IP Law.


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