Process for the extraction of metal values using substituted pyridine extractants
CA 1193265 A · Owner: Imperial Chemical Industries Plc · Inventors: Stewart, David; Quan, Peter M.; Price, Raymond
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Metal values are extracted from aqueous solutions of metal salts containing halide or pseudo halide ions by pyridine derivatives containing the substituent -(COX)A where X is the group -OR1 or -NR2R3 and n is 1 2 or 3. R1 is a hydrocarbyl group containing from 5 to 36 carbon atoms and R2 and R3 are hydrogen or a hydrocarbyl group wherein R2 and R3 together contain from 5 to 36 carbon atoms. The process is especially useful for the recovery of metals from leach solutions derived from sulphur-containing ores such as chalcopyrite.
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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 September 10, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 10, 2002.
- 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.