Expired Canadian patentCanada
Method for the froth flotation of coal
CA 1313277 C · Owner: The Dow Chemical Company · Inventors: Klimpel, Richard R.; Hansen, Robert D.
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The froth flotation of coal is conducted in the presence of a conditioner of an oxygen containing compound of the formula:, R1?0-R2)n (I) wherein R1 and each R2 are independently saturated hydrocarbyls and n is 1 to 3. 35,316-F
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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 January 26, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 26, 2010.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 2, 1988
GrantedJanuary 26, 1993
Term endedJanuary 26, 2010
Patent numberCA 1313277 C
Classification (IPC)B03D1/02 +1 more
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.