John D. Vandenberg

John D. Vandenberg is a senior partner at Klarquist Sparkman with a patent litigation practice spanning more than 35 years. His work primarily focuses on the software and internet technology sectors, representing major technology companies including Microsoft, SAP, and Siemens. While the provided data shows a lead counsel role for the plaintiff Valve Corporation, his firm biography highlights extensive experience defending technology clients against patent infringement claims.

Mr. Vandenberg has a significant appellate practice, having argued more than a dozen appeals before the U.S. Court of Appeals for the Federal Circuit. He famously argued for the petitioner before the U.S. Supreme Court in Nautilus, Inc. v. Biosig Instruments, Inc., which resulted in a unanimous decision that changed the standard for patent claim definiteness under 35 U.S.C. § 112. His practice also includes extensive experience as lead counsel in trial proceedings before the Patent Trial and Appeal Board (PTAB).

Mr. Vandenberg has been a partner at Klarquist Sparkman since 1991. He is the primary editor of patentdefenses.com, an online treatise on patent infringement defenses. He earned his J.D. from New York University School of Law and is admitted to practice in Oregon, Washington, and before the U.S. Patent and Trademark Office.