Surfactant for bitumen separation
CA 2433522 C · Owner: Tarsands Recovery Ltd · Inventors: Page, Pat; Monkman, Jack
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A surfactant for separating bitumen from sand includes an aqueous solution of hydrogen peroxide contacted with low rank coal. The low rank coal is preferably lignite. The surfactant may be used to clean bitumen heavy oil and/or tar from sand, shale or clay at low concentrations and with mild agitation.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed June 25, 2003 and granted August 27, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 25, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2025.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.