Ironburg Inventions v. Valve Corp. — Federal Circuit Clarifies IPR Estoppel Burden and Affirms Willful Infringement of Game Controller Patent
The Federal Circuit affirmed willful infringement of Ironburg’s video game controller patent by Valve’s Steam Controller, while vacating and clarifying the standard for IPR estoppel — holding that the patent owner, not the petitioner, bears the burden of proving estoppel applies.