Mark E. Deffner

Mark is a registered patent attorney and practices intellectual property and technology law. Mark is focused on helping his clients achieve business objectives and create competitive advantage through intellectual property tools. 

Mark believes that taking the time to learn his clients’ businesses allows him to provide more effective and valuable service. Mark diligently works with his clients to understand what contributes to their bottom line and then tailors strategies to maximize realized value.

“Mark’s legal and technical skills are top-notch.  But what I appreciate most about Mark is the uncommon degree of business acumen that he demonstrates time and again when providing us with advice about intellectual property matters.”  Daniel Brooks – President – Birchwood Casey

Mark assists clients with issues of protecting innovation, freedom to operate, business intelligence, and implementation of best practices.  Mark drafts and prosecutes patents in many different technical areas including general mechanical, business methods, software, sensors, IoT, medical devices, chemistry, material science, biofuels, biotechnology, and food science amongst others.

Mark’s formal education in chemistry and biotechnology and job experience with PricewaterhouseCoopers as a consultant programming SAP systems gives him a diverse set of technical skills.  

Amongst other professional activities, Mark is currently serving as President of the Minnesota Intellectual Property Law Association (MIPLA).

Mark has repeatedly been named a "Super Lawyer" by Minnesota Law & Politics Magazine and has also been identified as a “Top Patent Prosecutor”.



University of Wisconsin - Madison
B.S., Biochemistry, with distinction

Northwestern University
M.S., Biotechnology

University of Minnesota Law School
J.D., magna cum laude; Order of the Coif

Minnesota Intellectual Property Review

Bar Admissions

Minnesota State Bar
Minnesota Federal District Bar
Court of Appeals for the Federal Circuit
U.S. Patent and Trademark Office

Professional Affiliations

American Intellectual Property Law Association (AIPLA)
Minnesota Intellectual Property Law Association (MIPLA)