Method of removing ash components from high-ash coals
CA 1088444 A · Owner: Firma Carl Still · Inventors: Tippmer, Kurt
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of removing ash components from coals particularly high-ash bituminous and sub-bituminous coals comprises grinding the coals and suspending the ground coal in an aqueous media to form a raw suspension fusing, the raw suspension and without further additives stirring for 60 to 360 minutes at from 250°C to 350°C and at a pressure of from 50 to 80 atm. Thereupon the fused, suspension is cooled and the pressure thereof is relieved. The aqueous phase containing the dissolved ash components are separated from the coal.
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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 October 28, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 28, 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.