Intellectual Property Professionals

416-865-3515 Toronto

Mark Sajewycz

Partner - Lawyer, Patent & Trademark Agent


Mark Sajewycz is a partner at Ridout & Maybee LLP in the firm’s Toronto office. His practice consists of the acquisition, protection, commercialization and exploitation of patents, trademarks and industrial designs. Before practising law, he worked as an engineer in the nuclear industry.

Mark provides strategic advice on all aspects of patent law and protecting innovation. He is experienced in managing worldwide patent portfolios and is often retained to provide freedom-to-operate and validity opinions on complex technologies. He also assists in drafting and negotiating patent licensing, joint research and other technology-related agreements. Mark is also experienced in assisting Canadian companies in the patenting of various chemical and mechanical technologies. This includes organic and inorganic chemical compounds and compositions and various chemical processes and reaction systems, with a specific emphasis on energy-related (oil and gas, nuclear, biofuels) and clean technologies (water purification, fuel cells, batteries, solar).

Mark also teaches the advanced patent law course at Western University Law School.

View Mark Sajewycz’s publications

Education & Qualifications

  • B.A.Sc (Chemical Engineering), University of Toronto (1989)
  • LL.B., Western University (1995)
  • Barrister & Solicitor, Province of Ontario (1997)
  • Registered Patent Agent, Canada (2002)
  • Registered Patent Agent, U.S. (2003)
  • Registered Trademark Agent, Canada (2010)


  • Canadian Hydrogen and Fuel Cell Association (Past Director)
  • American Intellectual Property Law Association – AIPLA
  • International Association for the Protection of Intellectual Property – AIPPI
  • Intellectual Property Institute of Canada – IPIC
  • Professional Engineers Ontario – PEO
  • Chemical Institute of Canada – CIC
  • Intellectual Property Owners Association – IPO

Representative Experience

  • Patenting of steam-assisted gravity drainage (“SAGD”) processes for recovering bitumen from oil sands, including SAGD start-up, solvent-assisted SAGD processes, SAGD processes using non-condensable gases, and use of infill wells in late-stage SAGD processes
  • Patenting of downhole tools and well completion technologies, including shifting tools, sliding sleeves, locator tools, ball drop systems, jetting tools, and wiper plugs
  • Patenting of artificial lift technologies
  • Patenting/commercialization of heavy oil upgrading technologies
  • Supporting various patent litigation involving oil sands production technologies and oilfield services technologies
  • Retained by Alberta-based private equity firm for IP due diligence and IP transactional advice for acquisitions of oil & gas technologies
  • Advising on IP protection and commercialization strategies, conducting freedom-to-operate projects, patent drafting and prosecution and managing worldwide patent portfolio for oil sands producer
  • Advising on freedom to operate for engineering and construction company in respect of well pad designs
  • Advising on IP protection and commercialization strategies, conducting freedom-to-operate projects; patent drafting and prosecution and managing worldwide patent portfolio for biomass production/carbon capture technology company
  • Advising on acquisition of patent portfolio relating to novel well completion technology
  • Advising on freedom to operate novel waterflooding technology