Method and means for recovering hydrocarbons from oil sands by underground mining
CA 2735355 C · Owner: Osum Oil Sands Corp. · Inventors: Watson John D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed generally to the combined use of slurry mining and hydrocyclones to recover hydrocarbons such as bitumen, from , hydrocarbon-containing materials such as oil sands, and to selective mining of , valuable materials, particularly hydrocarbon-containing materials using a , plurality of , excavating devices and corresponding inputs for the excavated material. The excavated material captured by each input can be switched back-and-forth between , two or more destinations depending on the value of the stream.
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 May 31, 2004 and granted April 8, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 31, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 2026.
- 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.