Douglas J. Christensen

Partner, Patent Attorney
(612) 315-4102

Minneapolis Office
33 South Sixth Street, Suite 3950
Minneapolis, MN 55402


  • University of Minnesota, B.S. in Mechanical Engineering
  • Hamline University Law School, J.D. (1985)

Peer Recognition

Super Lawyers, 2006-2008, 2012-2015


Bar Admissions

  • Supreme Court of Minnesota
  • 8th Circuit Court of Appeals
  • U.S. Court of Appeals for Federal Circuit
  • U.S. District Court, District of Minnesota
  • U.S. Patent and Trademark Office

Membership Organizations

  • Minnesota Intellectual Property Law Association
  • American Intellectual Property Law Association
  • Minnesota State Bar Association
  • American Society of Mechanical Engineers

Doug Christensen is a registered patent attorney and has been a licensed attorney in Minnesota since 1985. Doug is involved in various aspects of intellectual property including client counseling, litigation, and patent and trademark prosecution.  Doug has prosecuted hundreds of patents in a variety of fields including mechanical, electrical, medical devices, optics, semiconductor fabrication technologies, plastic injection molding technologies, imaging technologies, and drilling technologies.

He was formerly a named partner at Patterson Thuente, Christensen, Pedersen, P.A. and Palmatier, Sjoquist, Voigt, and Christensen, P.A. and a founding partner at Christensen Fonder P.A.. Christensen Fonder P.A. merged with Dardi & Herbert, PLLC in 2017 to form Christensen Fonder Dardi P.A.. Prior to law school, Doug had significant mechanical design experience and worked as a drilling engineer in the oil/gas field in Texas and Louisiana.

In addition to prosecuting hundreds of patents, Doug has substantial litigation experience in intellectual property and product liability cases, including a substantial number of jury trials and arbitrations.

Doug’s clients greatly appreciate his inventor/engineer interviews where alternate embodiments of inventions from the anticipated commercial embodiments are envisioned and developed for inclusion in the patent applications, thereby discouraging or precluding design-arounds by competitors.  His technical abilities and litigation experience are very helpful in counseling his clients on designing around competitors’ patents and patent infringement risk assessment.

Doug’s pastimes include technically related activities. Doug has owned, maintained, and repaired numerous cars and recreational vehicles, including motorcycles, jet skis, atvs, boats, and snowmobiles.  Doug has personally finished several basements and enjoys being the handyman.  He has had his amateur radio operator license and built his own “home brew” equipment.

Doug enjoys golf, skiing, supporting his three kids in sports/activities, and family time at the cabin.