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John P. Guenther Partner

Tel (248) 594-0660
Fax (248) 594-0610

Practice Areas


University of Detroit Law School

  • J.D., cum laude

University of Michigan

  • B.S.M.E.


  • State Bar of Michigan, 1993
  • U.S. District Court, Eastern District of Michigan, 1993
  • U.S. District Court, Western District of Michigan, 2003
  • U.S. Supreme Court, 2004
  • U.S. Patent and Trademark Office
  • U.S. Court of Appeals, Federal Circuit, 2007

Organizations & Affiliations

Federal Bar Association

State Bar of Michigan

Oakland County Bar Association

Licensing Executives Society

American Intellectual Property Law Association

Michigan Intellectual Property Law Association

Honors & Awards

Animal Friendly Attorneys™ by Attorneys for Animals

AV® Preeminent Lawyer – Peer Review Rating of 5.0 out of 5.0 (Martindale-Hubbell)

Best Lawyers® – Patent and Trademark Law, 2016-Present

Client Choice Award – Intellectual Property: Patents, 2019

IP Stars® – Patent Star and Trademark Star

Leading Lawyers

Michigan Super Lawyers®

Top Lawyers – Dbusiness



John P. Guenther is a partner at Fishman Stewart.  John’s practice encompasses all aspects of intellectual property law, including domestic and international patent acquisition and maintenance, trademark and copyright registration; intellectual property enforcement and litigation; trade secret protection; high-profile product and trademark clearances; large scale due diligence efforts; joint venture and commercial agreements; and licensing. In his practice, he counsels and represents a number of Fortune 500 companies, as well as a number of mid-size and start-up organizations, and universities. He has significant experience in the automotive, plastics, aerospace, health system, medical device, advertising, and telematics fields/industries.

John is registered to practice before the United States Patent and Trademark Office (USPTO). He has been admitted to practice in the U.S. district courts in several states, the U.S. Court of Appeals for the Federal Circuit, and the Supreme Court of the United States. He is also a longtime member of the Licensing Executive Society (LES).

From 1993-1999, John Guenther served as in-house legal counsel and Director of Intellectual Property for a prominent plastics company with both domestic and international operations. His years of in-house experience provides him with unique insight and expertise in connection with intellectual property and practical business considerations.