Electrolytic process for generation of low-sulphate ferric hydroxide suspensions to effect purification of wastewater
CA 2282233 C · Owner: Goodwin, Ernest · Inventors: Goodwin, Ernest
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a process for treating wastewater which comprises producing a ferric hydroxide suspension directly by electrolysis of the wastewater to precipitate heavy metals and organic or inorganic suspended solids thus purifying the wastewater. The purified wastewater, which is a saturated aqueous solution of calcium sulphate, can be recycled for further treatment and production of a low sulphate ferric hydroxide suspension. The process of the present invention is suitable for treatment of wastewaters obtained from mine tailings dams metal mine pits, etc. and avoids the problems and difficulties of the known processes.
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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 September 16, 1999 and granted February 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 16, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 16, 2021.
- 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.