Noble metal recovery process
CA 2002183 A1 · Owner: Corbett, Andrew N. (Deceased) · Inventors: Corbett, Andrew N. (Deceased)
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A noble metal recovery process using counter current contact of a flow of slurry with a flow of mercury in droplet form which mercury is collected and filtered to remove amalgams for recovery of noble metals. An electric charge may be applied to the mercury droplets to enhance recovery. Other materials collected by the mercury may be removed in cleaning cycles designed for their removal. The process may be operated on a batch or continuous basis.
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
- Filed November 3, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 3, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 3, 2011.
- 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.