Beneficiation of low-rank coals by immersion in residuum
CA 1183349 A · Owner: Gulf Canada Resources Limited · Inventors: Wong, Brian Y.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of improving the calorific value and preventing autogenous heating of low-rank coals is disclosed which comprises crushing the coal into a particle size range from 0.1 cm to 3 cm, immersing the particles in a distillation residuum of petroleum crude oil at a temperature between 240°C and the decomposition temperature of the coal and, draining excess residuum from the particles to give a product preferably containing 2% to 15% by weight of the residuum. Some suitable residuum are the vacuum residuum of a hydrogen donor-refined Athabasca bitumen and low-penetration asphalt. The residuum coating material must have a softening point of at least 80°C. The decomposition temperature is …
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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 5, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 5, 2002.
- 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.