Promotors for froth flotation of coal
CA 1211870 A · Owner: Sherex Chemical Company, Inc. · Inventors: Keys, Robert O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is an improved process wherein coal particles are beneficiated by froth flotation under coal froth flotation conditions to separate the desired coal particles from remaining unwanted ash and like gangue material. The improvement of the present invention comprises conducting the froth flotation in the presence of an effective proportion of a promoter which is an aromatic or at least C10 aliphatic carboxylic acid or an aliphatic ester thereof which is devoid of nitrogen atoms; a nitrile promoter; the epoxidized, hydroxylated oxidized, or alkoxylated derivative, of said acid ester, and nitrile promoters; a higher fatty alcohol promoter and its alkoxylated derivatives; and mixtures …
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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 September 23, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 23, 2003.
- 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.