Expired Canadian patentCanada
Leaching of ores and the separation of mixed sulphide precipitates
CA 1112053 A · Owner: University Of Western Australia (The) · Inventors: Holliday, Robert I.
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process of leaching sulphide ores which comprises leaching the ore with a copper (11) sulphate solution and separating the insoluble copper (11) sulphide produced and the insoluble components of the ore from the leach solution.
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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 November 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 10, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 18, 1978
GrantedNovember 10, 1981
Term endedNovember 10, 1998
Patent numberCA 1112053 A
Classification (IPC)C22B3/00
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.