Expired Canadian patentCanada
Solvent extraction of copper values using dihydroxy azoarenes
CA 1086959 A · Owner: Union Carbide Corporation · Inventors: Tancredi, John F.; Sullivan, Patrick B.; Mitchell, Glenn F.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Copper values are extracted from aqueous solution by dihydroxy azoarenes dissolved in a water immiscible organic solvent. S P E C I F I C A T I O N -1-
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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 7, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 7, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 19, 1976
GrantedOctober 7, 1980
Term endedOctober 7, 1997
Patent numberCA 1086959 A
Classification (IPC)C22B3/28 +1 more
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.