Osler, Hoskin & Harcourt LLP

With an integrated network of offices in Toronto, Montreal, Calgary, Ottawa, New York and Vancouver, Osler, Hoskin & Harcourt LLP’s team of more than 460 lawyers, patent agents and trademark agents has the breadth and depth of experience to help solve clients’ problems and provide the answers that they need in all areas of business law, including intellectual property.

Strength in intellectual property

Our top-ranked IP team is renowned for its diverse strengths, including IP litigation and patent disputes. We have acted as counsel in complex litigation in every field of intellectual property and before every level of the Canadian courts, and have coordinated and managed prosecution and litigation strategies through multiple jurisdictions. Our international reputation for excellence in Canadian IP patent litigation has been built on our winning litigation record, representing some of the world’s largest generic pharmaceutical, technology, biotech, life sciences, electronics, energy, consumer products and many other international and domestic innovators.

We have extensive experience in drafting, filing, prosecuting and maintaining patent and industrial design applications in Canada and the United States, including for Canadian and multinational companies in medical devices, electronics, consumer products, chemistry, biotechnology, pharmaceuticals, sports, food services and other sectors. We also supervise the filing and prosecution of patent applications outside North America on behalf of clients through our network of foreign associate law firms. The Osler IP team also serves a growing and robust international practice, representing Canadian patent interests of foreign companies.

Osler’s integrated team of professionals is involved in preparing numerous patent infringement and validity opinions, drafting patents and advising on the exploitation of obtaining IP rights with a coordinated worldwide strategy consistent with clients’ commercial business. Our exposure to complex litigation matters has proven invaluable in our drafting and prosecution practices – we are well aware of the many pitfalls to avoid.


Osler's Patent team has been recognised as one of the leading practices in Canada by IAM Patent 1000, Chambers Canada, IP StarsThe Canadian Legal Lexpert Directory, The Legal 500 and Benchmark Canada.

Recent notable cases

  • Lead outside counsel to Mylan Pharmaceuticals in connection with numerous complex patent litigation, class action and other matters, including ongoing cases seeking early market entry.
  • Representing Teva Canada in numerous Patented Medicines (Notice of Compliance) Regulations proceedings.
  • Acting in Yves Choueifaty v Attorney General of Canada  an important decision that should help provide clarity on the correct approach to claim construction when a patent application is being prosecuted before the Canadian Intellectual Property Office.
  • Representing Awesense Wireless Inc in a complex patent proceeding before the Federal Court.
  • Representing VMware in a complex technology patent proceeding before the Federal Court.
  • Lead Canadian counsel responsible for the prosecution, management, enforcement and licensing of patent and industrial design portfolios for various leading national and multinational companies, or indirectly through foreign law firms on an agency basis.

Contact details

Osler, Hoskin & Harcourt LLP
First Canadian Place
100 King Street West
Ontario M5X 1B8

Professional contacts

Other offices

  • Calgary
  • Montreal
  • New York
  • Ottawa
  • Vancouver

Sample client list

  • Awesense Wireless
  • Mylan Pharmaceuticals
  • Samsung Bioepis
  • Teva Pharmaceuticals
  • VMware
  • WOW Tech