Process for recovering metals
CA 1180902 A · Owner: Sumitomo Metal Mining Company Limited · Inventors: Okajima, Yasuhiro; Kitagawa, Masatoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A carbonaceous reducing agent at least one of calcium, oxide and a substance capable of forming calcium oxide and a, sodium salt are admixed into a substance containing a sulfide of at least one of nickel, cobalt and copper. The resulting mixture is heated to at least 750°C directly by a non-reducing gas, such as the combustion product of heavy oil. A metal or metals are recovered in powder form by beneficial methods and acid washing from the roasted product.
Read the whole patent
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 January 15, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 15, 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
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.