Solvent extraction recovery of shale oil
CA 1180294 A · Owner: United States (Government Of The) Of America As Represented By The United States Department Of Energy · Inventors: Chong, Shuang-Ling; Mckay, John F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved process for solvent extraction of organic matter from shale by two extraction steps in sequence. The extraction steps are: (a) treating a kerogen-containing shale with a solvent system comprising a combination of water and an alcohol at a temperature of about 375°-425°C, and (b) treating the product of (a) with a solvent system comprising a combination of an alcohol and another organic solvent at an elevated temperature, but not above about 425°C. The organic matter is recovered by separating the liquid which results from step (b) from the shale solids.
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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 January 2, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 2, 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.