Andrew Dufresne Photo

Andrew T. Dufresne, Ph.D.



Andrew helps clients protect and defend their intellectual property assets. His practice concentrates on:

  • Patent prosecution, reexamination, ex parte appeals, and trial proceedings before the United States Patent and Trademark Office (USPTO)
  • Patent litigation matters in federal district court
  • Appellate practice before the U.S. Court of Appeals for the Federal Circuit
  • Strategic counseling in patent-related matters such as patentability and freedom-to-operate assessments

Before joining Michael Best, Andrew served for two years as a law clerk to the Honorable Alan D. Lourie of the U.S. Court of Appeals for the Federal Circuit. In addition to his legal training, Andrew has a Ph.D. in molecular genetics and microbiology. This technical background provides him with an in-depth perspective on the issues facing innovators in the chemical and life sciences.

He has spoken and written on topics ranging from inter partes review (IPR) to recent Federal Circuit and Supreme Court patent law decisions.

Andrew also serves as an adjunct professor of law at Marquette University Law School, where he teaches patent litigation.


Representative matters include:

  • Successful representation of numerous clients in ex parte appeals before the USPTO Patent Trial and Appeal Board, overturning final rejections imposed during patent prosecution and resulting in issued patents
  • Successfully defending an innovative manufacturer of computerized livestock monitoring devices against patent infringement allegations in the Western District of Wisconsin. Andrew efficiently obtained a summary judgment decision of noninfringement as to all asserted claims.
  • Assisting clients in the pharmaceutical and biotechnology industries in obtaining patent protection for their inventions during patent prosecution before the USPTO
  • Assisting numerous university clients in preparing and filing U.S. and international patent applications for a variety of chemical and life sciences technologies. Andrew’s work for these clients also involved devising strategies for efficient and effective patent prosecution and patent coverage.

Honors & Recognitions

  • Member, 2016 Pro Bono Honor Society, Wisconsin Access to Justice Commission
  • Giles Sutherland Rich Memorial Scholarship, Federal Circuit Bar Association
  • Fellow of the Berkeley Center for Law & Technology, 2009-2010

Professional Activities

  • Member, American Bar Association, IP Section
  • Member, Federal Circuit Bar Association
  • Member, State Bar of Wisconsin
  • Member, State Bar of Minnesota



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