Method for the recovery of cyanides from solutions
CA 2061780 A1 · Owner: Boateng, Daniel A. D. · Inventors: Boateng, Daniel A. D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Cyanide-containing solution is subjected to two-stage membrane electrolysis in units each comprising a cathode an anode and one or more bipolar electrodes interspaced with cationic membranes defining alternating anode and cathode compartments containing anolyte and catholyte respectively. Electrolysis causes generation of hydrogen cyanide in the recirculating first stage anolyte and, alkali metal hydroxide is formed in the recirculating first-stage catholyte. The hydrogen cyanide is stripped from the first stage anolyte and is subsequently absorbed in catholyte in an absorption unit for the recovery of alkali metal cyanide-containing solution. Partially cyanide-depleted first-stage anolyte …
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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
- Filed February 25, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 2014.
- 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.