Solvent extraction of tar sand
CA 1107670 A · Owner: Phillips Petroleum Company · Inventors: Hanson, Donald O.; Sherk, Fred T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure An extraction process for recovering bitumens from tar sands in which the tar sand is mixed with a hot hydrocarbon solvent, for example, toluene, in order to evaporate substantially all the water contained in the tar sands. The tar sands-solvent mixture is then separated into two phases of fine and coarse sand. Two centrifuging steps are then used to recover the bitumen from the fine said phase.
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
- Granted August 25, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 25, 1998.
- 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.