Tag: Prior Art Search
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Ironburg v. Valve: Federal Circuit Clarifies How Parties Must Prove IPR Estoppel Under §315(e)
The Federal Circuit’s decision in Ironburg Inventions Ltd. v. Valve Corp., Case No. 2024-2088 (Fed. Cir. June 18, 2026), limits when a patent owner may use inter partes review estoppel to prevent an accused infringer from asserting prior-art invalidity grounds in district court. The court held that a reference is not necessarily discoverable merely because…