On September 4, the United States Court of Appeals for the Federal Circuit (CAFC) modified and reissued its March 18, 2020 opinion in Facebook v. Windy City Innovations, LLC, following Facebook’s combined petition for panel rehearing and rehearing en banc. In the March 18 opinion, the CAFC ruled that the Patent Trial and Appeal Board (PTAB) erred both in allowing Facebook to join itself to a proceeding in which it was already a party, and in allowing Facebook to add new claims to the inter partes reviews (IPRs) at issue through that joinder.

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