Photo of Stephen (Steve) L. Hennessy

Stephen (Steve) L. Hennessy Senior Attorney

Areas of Practice

Bar Admissions

  • Minnesota, 2008
  • District of Columbia, 2008

Court Admissions

  • U.S. Court of Appeals for Veterans Claims
  • U.S. Court of Appeals, Federal Circuit
  • U.S. Supreme Court
  • U.S. Patent and Trademark Office


Mitchell Hamline School of Law (formerly William Mitchell College of Law), J.D., 2007

University of Minnesota - Twin Cities, B.S., 1996

Steve Hennessy is a senior attorney in Dykema's Minneapolis office where his practice focuses on patent litigation and prosecution. He is experienced in all aspects of patent litigation and drafts and prosecutes U.S. patent applications and coordinates foreign patent prosecution. 

Mr. Hennessy has a strong background in material sciences, chemistry, automotive transmissions, heat treatment processes, water filtration, pipes and pipelines for coal, gas, oil, and power plants, laboratory equipment, and complex industrial processes. He has assisted clients in the preparation and prosecution of patent applications in the areas of medical devices, electromechanical devices, electronic smoking devices, audio speakers, fire protection materials, additive manufacturing processes, business methods, inventory control systems, and financial payment systems.

Memberships & Involvement

  • American Bar Association, Member
  • American Intellectual Property Law Association, Member
  • Minnesota Intellectual Property Law Association, Member
  • Minnesota State Bar Association, Member
  • District of Columbia Bar Association, Member
  • Intellectual Property Owners Association: U.S. Patent Law Committee, Member

Community/Civic Activities

  • Minnesota Distance Running Association, Board of Directors, Treasurer
  • Mitchell Hamline School of Law Alumni Board
  • Minnesota State Bar Association North Star Lawyer (2012 – 2017)