Method and installation for concentrating heavy metals, precious metals or heavy minerals in sand or gravel
CA 1202285 A · Owner: Schmid, Gustav · Inventors: Schmid, Gustav
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for concentrating precious metals and heavy minerals in sand or gravel deposits and an apparatus for carrying out the method. The method comprises pre-classifying the raw material suspended as a slurry in water by means of screen means into two to six fractions. Each fraction as a slurry in water is provided with a flow velocity of about 0.25 to about 0.50 m/sec. over a length of about 3 m. The flow is retarded and stopped to provide a plurality of volumes separated from each other in the direction of flow in the lower range of the overall height of the fluidized bid. Each flowing volume is treated during the retarded flow condition in its lower range of …
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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 March 25, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 25, 2003.
- 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.