We’ve moved! Effective June 1, 2023, we are located at 7285 W. 132nd Street, Suite 340, Overland Park, KS.

John C. McMahon
Patent Attorney

John C. McMahon

Patent Attorney


  • University of Missouri at Kansas City School of Law, J.D.
  • University of Kansas, B.A. Math & Chemistry, B.S. Chemical Engineering
  • University of Missouri at Kansas City, MBA


  • Missouri State Bar, 1978
  • Kansas State Bar
  • U.S. Patent and Trademark Office, 1979


  • AV Preeminent, Martindale-Hubble
  • Senior Status, Missouri Bar

Mr. McMahon worked as a chemical engineer for Proctor and Gamble for seven years, prior to entering patent law practice. In 1976, while in law school, he joined the law firm of Fishburn, Gold and Litman, which was established in 1843. He became managing partner of the firm in 1982. In 2000, he formed a separate firm. Mr. McMahon’s practice is mainly in the preparation and prosecution of patents and trademarks, but also is involved in other intellectual property matters.


  • The Missouri Bar Association
  • Kansas Bar Association
  • American Institute of Chemical Engineers
  • American Chemical Society