Professional Legal Counsel


Mr. Sander Gelsing is a Canadian lawyer and registered patent and trademark agent. He is a partner at the law firm of Warren Sinclair LLP, where he has led the intellectual property team for over a decade.


We’ve registered hundreds of patents and trademarks for our clients over the years. We act for clients across Canada and in numerous countries around the world. We are based out of Central Alberta, Canada which is strategically located between two major urban centres, Calgary & Edmonton, including two international airports. As such, our law firm is easily accessible to a local market area population of 2.4 million.


Our offices

Our offices

We can assist you with all your Canadian patent, trademark and copyright matters, including with patent and trademark searching, preparing and filing applications, licensing Canadian rights, trademark oppositions, trademark expungement proceedings, patent enforcement, domain name disputes and with the purchase and sale of intellectual property.


Mr. Sander Gelsing, provides representation before the Canadian Intellectual Property Office, the Trademark Opposition Board, the Patent generic propecia Appeal Board and various Canadian courts, including the Federal Court. He has over twelve years experience.


We are members of INTA (International Trademark Association) and IPIC (Intellectual Property Institute of Canada). This allows us to stay updated on the latest developments in patent and trademark law and to network with intellectual property practitioners world-wide.


Client Testimonials

It is a pleasure to work with Sander Gelsing on Canadian trademark matters. He explores each matter thoroughly and provides well-explained options for the clients. He is easy to work with, and is a person of high integrity. – Alena Herranen (U.S. Attorney)

Sander is my Canadian counterpart. I am so pleased to work with him in this capacity. Sander is detail-oriented while maintaining the highest quality standards and being cost competative. Additionally, Sander is a pleasant person with whom to do business. – Pat Costanzo (Patent and Trademark Attorney)


Email us at: or send us your questions using the contact form on the right. We look forward to hearing from you.