Method for recovering precious metals from precious metal-bearing materials such as ore and tailings
CA 1237283 A · Owner: Russ, James J. · Inventors: Smith, John W.; Russ, James J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
METHOD FOR RECOVERING PRECIOUS METALS, FROM PRECIOUS METAL-BEARING MATERIALS SUCH AS ORE AND TAILINGS, by, JAMES J. RUSS and, JOHN W. SMITH, ABSTRACT OF THE DISCLOSURE A method for recovering precious metals such as gold and silver from precious metal-bearing materials that include other solids comprises treating the precious metal-bearing materials with an aqueous, basic solution having a pH in the range of about 12 to about 14 for a time sufficient to suspend the precious metals in substantially free form in the solution followed by recovery of precious metals from solids and from the solution by known methods.
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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 May 31, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 31, 2005.
- 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.