Oxidative leach process for extracting metal from ore
CA 2446504 A1 · Owner: Pearce, James David · Inventors: Pearce, David; Pearce, James David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to an improved electrochemical process for winning platinum group and incidental precious metals from ore. The process utilizes a peroxide leach in combination with electricity to produce hyper-oxides and comprises the following steps: combining ground ore a solution comprising water, with a selected amount of H2O2 and an anion source to form a slurry applying , a, direct current to the slurry while allowing the metal in the ore to leach into the, solution for a selected period of time; filtering and clarifying the leached slurry to, obtain a pregnant solution, and treating the pregnant solution to yield metal metal salts or both.
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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 October 27, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 27, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 27, 2025.
- 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.