A method for anion-exchange adsorption and anion-exchangers
CA 2389515 C · Owner: Belew, Makonnen · Inventors: Belew, Makonnen; Johansson, Bo-Lennart; Gustavsson, Jan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the removal of a substance carrying a negative charge and being present in an aqueous liquid (I). The method comprises the steps of: (i) contacting the liquid with a matrix carrying a plurality of ligands comprising a positively charged structure and a hydrophobic structure and (ii) desorbing , the substance. The characterizing feature is that (I) each of said ligands together with a spacer has the formula: -- SP---Ar-R1-N+(R2R3R4) where (A) Ar-R1-N+(R2R3R4) represents a ligand a) Ar is an aromatic ring b) R1 is , (L)nR'1m where n and m are integers selected amongst zero or 1; L is amino nitrogen, ether oxygen or thioether sulphur; R'1 is a linker selected among 1) …
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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 November 22, 2000 and granted August 28, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 22, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 22, 2022.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.