Flotation process using a mixture of collectors
CA 2062767 A1 · Owner: Bush, James H. · Inventors: Bush, James H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to improved process for beneficiating an ore-containing sulfide material. In particular the process, is useful for beneficiating ores and recovering metals such as gold, copper, lead, molybdenum, zinc, etc. from the ores. In one embodiment, the process comprises the steps of: (1) forming a slurry comprising at least one crushed mineral-containing ore water, and a collector which is a mixture of (A) at least one metal salt of a phosphorus acid represented by formula (I) wherein each, R1 is independently a hydrocarbyl hydrocarbyloxy or, hydrocarbylthio group having from 1 to about 18 carbon atoms each X is, independently oxygen or sulfur and the lowest oxidation …
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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 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 6, 2013.
- 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.