In situ tar sands reduced pressure separation process and apparatus
CA 2013987 C · Owner: 495695 Alberta Ltd. · Inventors: Broughton, Robert I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Tar sands separation process that includes farming a cavity in the producing zone of an in situ body of tar sands, filling the cavity with water closing the, cavity to atmosphere and subjecting the sealed-in cavity to a negative pressure. Separation of the bitumen and sands takes place at the walls of the cavity and the separated sand sinks in the water to the bottom of the cavity and the bitumen rises to the top portion of the cavity wherefrom it is removed as by pumping or the like. The negative pressure can be varied cyclically and/or the water can be mechanically agitated.
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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 April 5, 1990 and granted December 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 5, 2012.
- 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.