Method and apparatus for purification of gold
CA 1291063 C · Owner: Shor, Peter Scott · Inventors: Shor, Peter Scott
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and unitary apparatus purifies solid metallic gold. For that purpose, the gold to be purified is immersed and electrolytically dissolved into a pregnant electrolyte comprising an aqueous solution of a halide ion source impregnated with a catalyst preferably a peroxide or a nascent oxygen source for, leveling the overvoltage of gold. The dissolved gold ions are segregated from the cathode by a semi-permeable barrier, the insoluble impurities are separated from the gold-containing liquidus, and then the gold is selectively reduced to metallic form from the liquidus by a selective chemical reducing agent. With this method and apparatus, gold in metallic form of at least 99.95% purity …
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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 October 22, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 22, 2008.
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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.