John D. Vandenberg


Portland Office



For more than 35 years, John has been litigating patents around the country for technology clients including Microsoft, SAP, ETAP, Nautilus, and Siemens.

Supreme Court and Courts of Appeals: John has argued more than a dozen appeals before the Court of Appeals for the Federal Circuit. He successfully argued before the Supreme Court of the United States in Nautilus, Inc. v. Biosig Instruments, Inc., No. 13-369, for rejection of the Federal Circuit’s “insolubly ambiguous” and “amenable to construction” test for enforcing the Patent Act’s mandate that patent claims “particularly point[ ] out and distinctly claim [ ]” the patent’s invention.

Court Trials: John has first-chair tried patent infringement suits, copyright infringement suits, trademark infringement suits, and product-configuration trade dress suits. He and a team at Klarquist obtained an $8.42 Million jury verdict in a false advertising action.

PTAB Trials: John has been lead counsel in Patent Office trial proceedings.

Patent-Law Training and Advocacy: Since 2004, John has been the primary editor of an extensive summary of substantive defenses and related strategies in patent infringement suits, posted at He speaks throughout the nation on patent law, district-court patent litigation, PTAB patent trials, and patent appellate practice. He emphasizes untraditional approaches to successfully defending against a patent infringement suit while improving the law and patent system in the process. To the same end, he has authored many Amici briefs in the U.S. Supreme Court and the Federal Circuit on behalf of scores of technology companies and associations.

Patent Arbitrator: John is available to arbitrate patent disputes.

John joined Klarquist in 1989 as an associate and became partner in 1991.

Practice Areas
Professional Experience
Professional Activities
Honors & Awards
Presentations & Publications
Representative Cases
Amici Briefs