Controlled acid - strong acid strip process
CA 2133184 C · Owner: Swider, Richard C. Consulting Engineers Limited · Inventors: Swider, Richard C.; Webster, Steven A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is concerned with a controlled multi-stage process for the stripping of uranium, which comprises introducing at one end of a solvent extraction device a uranium loaded organic solution and introducing a, stripping acidic aqueous solution at the other end of the extraction device so that, the aqueous solution and the organic solution are contacted counter-currently in the device; each stage comprising the steps of: a) separating partly stripped organic solution from stripping aqueous solution;, b) adding acid to the stripping aqueous solution until the acid concentration is substantially that of the acidic aqueous solution introduced at the one end of the extraction …
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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 28, 1994 and granted April 22, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2016.
- 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.