Coal recovery system from mine tailings
CA 1091622 A · Owner: The Dow Chemical Company · Inventors: Vivian, Thomas A.; Deimler, James D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention resides in the area of separating coal from the accompanying gangue. The coal and gangue are contacted with water and a water-immiscible organic liquid, agitation applied and the water fraction and organic liquid fraction are separated. Depending on the ratio of water and organic liquid to coal-gangue, the gangue and water are drawn off from the top of the mixture and the coal and organic liquid from the bottom or the water-coal from the top and gangue- -liquid from the bottom. The advantages produced are a lower sulfur content and lower ash content.
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 December 16, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 16, 1997.
- 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.