Kenneth W. Darby

Analyst Summary: Kenneth W. Darby

Date: 2026-05-10

Kenneth W. Darby is a Principal in the Austin office of Fish & Richardson P.C. His practice focuses on complex patent litigation with a particular emphasis on post-grant proceedings before the Patent Trial and Appeal Board (PTAB). An engineer by training, Mr. Darby has experience across a range of technologies, including mechanical arts, medical devices, semiconductor manufacturing, distributed computing architectures, and telecommunications.

While the tracked case list shows a single appearance on behalf of a defendant, Aml Ip LLC v. Expedia, Inc., Mr. Darby's broader practice includes representing both patent owners and petitioners. A core strength of his practice is his extensive experience in post-grant matters; he has served as counsel in more than 100 PTAB proceedings and is often designated lead counsel. His work includes drafting petitions and briefs, developing case strategy, and arguing before the Board and the U.S. Court of Appeals for the Federal Circuit. He frequently writes and speaks on PTAB strategy and developments in patent law.

Mr. Darby has been with Fish & Richardson for his entire career as an attorney, having first started as a patent agent before attending law school. His practice also includes strategic patent portfolio development, IP due diligence, and freedom-to-operate analyses.

Mr. Darby earned his B.S. in Mechanical Engineering and his J.D., with honors, from the University of Texas at Austin. He is admitted to practice in Texas, before the U.S. Patent and Trademark Office, the U.S. Court of Appeals for the Federal Circuit, and the U.S. District Court for the Western District of Texas.