Denis V. Keseris

Based in Gowling WLG’s Montréal office, Denis is a partner, patent agent and member of the Intellectual Property Law Group. His practice covers all aspects of patents, particularly strategic patent procurement in the fields of artificial intelligence, fintech, medical devices, software and telecommunications.

Denis helps clients develop and manage commercially useful patent portfolios in a range of technical fields, as well as advising clients on contentious matters and the commercialization of medical devices and computer-implemented inventions.

He has 20 years of IP experience across Canada, the United States, France and the United Kingdom. Notably, Denis spent a significant portion of his career practicing in the United Kingdom, where he was a partner in one of Europe's leading IP law firms.

Previously, Denis also practiced at a well-known technology company, where he was responsible for growing its European optical networking patent portfolio.

Before entering private practice, Denis was a patent examiner at both the Canadian Intellectual Property Office and the U.K. Intellectual Property Office.

Career & Recognition

Filter timeline:
  • 2023

    • Education
      Listed in World IP Review: Leaders
  • 2022

    • Rankings & Awards
      Listed in World IP Review: Leaders
    • Career
      Registered Canadian Patent Agent
    • Career
      Registered United States Patent Agent
  • 2020

    • Rankings & Awards
      Lexology Legal Influencer Q4
  • 2012

    • Education
      Intellectual Property Litigation Certificate (GB)
  • 2009

    • Career
      Chartered Patent Attorney (GB)
  • 2008

    • Career
      European Patent Attorney
  • 2005

    • Education
      PGC, Intellectual Property Law, University of London
  • 2002

    • Education
      B.A.Sc. Electrical, Electronics & Communications Engineering, University of Ottawa


  • Fellow of the Chartered Institute of Patent Attorneys (CIPA)

  • College of Patent Agents and Trademark Agents (CPATA)

  • Intellectual Property Institute of Canada (IPIC)

  • Intellectual Property Regulation Board (IPReg)