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FICPI, The International Federation of Intellectual Property Attorneys

Please mention that you found this IP professional through the FICPI website.

Mr. Douglas Deeth

Mr. Douglas
Deeth Williams Wall

150 York Street
Suite 400
M5H 3S5



Tel: +1-416-941 9442

Fax: +1-416-941 9443


Doug Deeth was admitted to the Bar of Ontario in 1976. He is a Registered Canadian Patent and Trademark Agent and Registered U.S. Patent and Trademark Agent. Doug is a founding member of Deeth Williams Wall LLP. He practises exclusively in the areas of intellectual property and technology law, concentrating on litigation and licensing matters. Doug has more than thirty years of litigation experience. He appears regularly before the Federal Court of Canada and the courts of the Province of Ontario. His practice combines his extensive litigation experience with an expertise in drafting and negotiating license and product development agreements. He provides timely, practical and pragmatic advice to clients on the clearance, protection and enforcement of all forms of technology and intellectual property rights, and has particular expertise in chemical and pharmaceutical products and processes.

Doug has taught, written and spoken extensively on intellectual property law. He has lectured at McMaster University, the University of Toronto and Osgoode Hall law schools and the McGill courses on Patent and Copyright Law.

Academic Qualifications

​B.A.Sc. (Chem.Eng., Waterloo) LL.B.(Toronto)

Country of practice


Professional Experience

  • Design and copyright litigation
  • IP due diligence
  • Licensing and IP-related agreements
  • Patent litigation
  • Trade mark litigation

Country/Region of membership


Technical Specialisms

  • Biochemistry and pharmacology
  • Chemistry
  • Food technology
  • Materials; polymer science
  • Medical and veterinary methods and products

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