Process for selectively aggregating coal powder
CA 1163943 A · Owner: Idemitsu Kosan Co. Ltd. · Inventors: Oka, Naoki; Ando, Takashi; Tanaka, Nobuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for removing ash from raw coal is described comprising adding mineral oil to a slurry composed of a coal powder and water, granulating the coal by stirring to form granules, and separating the resulting coal granules by a screen, wherein the improvement comprises granulating the coal using a mineral oil mixture consisting of from 0.1 to 10 % by weight of a heavy fraction having a boiling point of at least 330°C and from 90 to 99.9 % by weight of a light fraction having a boiling point of 230°C or less, heating the coal granules separated by the screen to evaporate and recover almost all of the light fraction, and reusing the recovered light fraction for granulation of additional …
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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 March 20, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 20, 2001.
- 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.