Method and apparatus for process for processing ground-up mixtures of minerals
CA 2019959 C · Owner: Fricke, Gunter · Inventors: Singewald, Arno; Kirchner, Siegfried; Gotte, Jost
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process and a device is disclosed for the electrostatic separation of mineral mixtures, especially raw potassium salts in a free fall separator, into, a coarse fraction and a fine fraction after the ground-up mixture has been, conditioned and electrostatically charged. Each of the fractions is separately electrostatically processed and the fine fraction is fed to a free fall separator where a vertical air flow is generated in the direction from the inlet to foot of the separator. To generate the air flow tubes or annular pipes made of, electrically non-conducting material are arranged in the discharge ducts of the free fall separator. These devices have nozzle openings oriented towards …
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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
- Filed June 27, 1990 and granted September 10, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 27, 2012.
- 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
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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.