Method for refining aqueous nickel chloride solution
CA 2481729 C · Owner: Matsumoto, Nobuhiro · Inventors: Nishikawa, Isao; Takaishi, Kazuyuki; Matsumoto, Nobuhiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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A method for refining an aqueous nickel chloride solution to efficiently remove an impurity element in particular zinc, which can form a complex with chlorine from the solution by a simple system at a low cost. More concretely method for refining an aqueous nickel chloride solution containing zinc and one or more other impurity elements which can form a complex with chlorine comprising a first step for oxidation/neutralization of the solution adjusted beforehand under given conditions with respect to Ni concentration oxidation-reduction potential and pH to remove the impurity elements and a second step for ion-exchanging the solution refined by the first step with an anion-exchange resin to …
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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 15, 2004 and granted March 27, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 15, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 15, 2026.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.