Selective flotation of gold
CA 2015604 C · Owner: American Cyanamid Company · Inventors: Fleming, Shane D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Collector compositions for use in froth flotation processes for the beneficiation of gold silver and, platinum group values from base metal ores are disclosed. The collector compositions comprise at least one monothiophosphate compound selected from compounds of the formula:, (see formula I), wherein each R is a C2-C8 alkyl or a (see formula II), radical, R1 and R2 are individually, hydrogen or C1-C4, alkyl radicals n is 0 or 1 and X is a cation. The use of the monothiophosphate collectors provides excellent selective recovery of gold, silver and platinum group metal values in froth flotation processes conducted under alkaline conditions.
Read the whole patent
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 April 27, 1990 and granted June 20, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 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
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.