Method for passivating particulate coal
CA 1285515 C · Owner: Alberta Research Council · Inventors: Souhrada, Frank; Kennepohl, Gerhard J.A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A method is disclosed for drying and passivating wet coals, for example bituminous, subbituminous or lignite. The wet coal is preheated with hot dry gas in an initial heating zone then, is contacted with a heavy hydrocarbonaceous treatment material having a softening point at least 60°C. The coated particles are further heated to a temperature of at least 200°C but below the coal decomposition temperature for a time of about 0.5 to 20 minutes, and cooled.
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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 July 2, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 2, 2008.
- 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.