Method for separating copper from iron
CA 2381691 A1 · Owner: Mattison, Phillip · Inventors: Sudderth, R. Brantley; Wolfe, George A.; Kang, Sang I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Copper is preferentially extracted from iron in an aqueous feedstock solution containing dissolved copper and iron values by contacting the feedstock solution with a water-immiscible organic solution comprised of a hydrocarbon solvent and a compound of formula (I), wherein R5 is a C1-22 linear or branched alkyl group, a C2-22 linear or branched alkenyl group a C6 aryl , group, a C7-22 arakyl group a halogen, OH or -OR6 wherein R6 is a C1-22 linear or branched alkyl group, a C2-22 linear or branched alkenyl group a C6 , aryl group, a C7-22 aralkyl group; R1 is hydrogen or a C1-22 linear or , branched alkyl or alkenyl group a C6 aryl group or a C7-22 aralkyl group; R2 - R4 is hydrogen, …
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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 August 10, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 10, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 10, 2022.
- 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.