In Facebook v. Windy City Innovations LLC, the Federal Circuit held that 35 U.S.C. § 315(c) does not authorize same-party joinder, and does not authorize joinder of new issues (e.g., for cancellation), including issues that would otherwise be time-barred under 35 U.S.C. § 315(b) from inter partes review (IPR).
Unless Federal courts require infringement contentions well within one year of the service of an infringement complaint, this seems to increase legal fees for effective IPR petitions and increase the value of US patents with diverse claims.
See Bloomberg Law Patent Challengers Reassess Strategies After Ruling Bars Tactic.
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