Recovery of bituminous oil from tar sands
CA 1197203 A · Owner: Chang, Ming-Cheng · Inventors: Chang, Ming-Cheng
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is related to a method of separating the bituminous oil from the solid matters in the oil-bearing sand such as the Athabasca tar sands by subjecting the tar sands in a sub-ultracentrifugal field of sufficient strength and for a sufficient period of time to effect the separation. The recovery of oil is promoted by centrifugal sedimentation employing an aqueous alkaline displacement medium having a specific gravity substantially higher than the oil but lower than the sands thereof.
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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
- Granted November 26, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 26, 2002.
- 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.