 Patent Law Weblog Steam Controller Litigation Makes Another Appearance before Federal Circuit By Andrew Velzen -- Introduction On April 23, 2025, the Federal Circuit rendered an opinion in Valve Corp. v. Ironburg Inventions Ltd. surrounding U.S. Patent No. 9,289,688 (the '688 patent"). This marks the second time that the Federal Circuit has weighed in on this patent (the Federal Circuit has also issued an opinion in a related case between the same two litigants over U.S. Patent No. 8,641,525). A proper discussion of the opinion, and of valuable takeaways therefrom, requires a review of the somewhat convoluted procedural history surrounding the litigation. Ironburg... 
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