Federal Circuit Partially Upholds PTAB Ruling in Cisco IPR Case

The U.S. Court of Appeals for the Federal Circuit (CAFC) has vacated in part and affirmed in part a Patent Trial and Appeal Board (PTAB) final written decision in Zilkr Cloud Technologies, LLC v. Cisco Systems, Inc.

The case involved a patent owned by Zilkr Cloud Technologies related to a unified services platform that integrates communication services for a user using the user's telephone number as a common subscriber identifier.

Cisco Systems filed a petition for inter partes review (IPR) of the challenged claims, which the PTAB held unpatentable as obvious. The CAFC remanded the case for further proceedings after vacating and affirming certain parts of the decision.