Process for the preparation of a polymeric ion-exchange material with sulfonic acid groups, and material obtained
CA 2126584 C · Owner: Centre Technique Industriel Dit: Institut Textile De France · Inventors: Chatelin, Roger; Gavet, Louis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The process of the invention for the preparation of a polymeric ion-exchange material with sulfonic acid groups consists in:, a) grafting onto said material an ethylenically unsaturated monomer with a tertiary amine group for example, morpholinoethyl or dimethylaminoethyl methacrylate and, b) reacting sodium sulfite with the grafted material. Depending on the operating conditions the, material obtained contains sulfonic acid groups by themselves or in association with tertiary amine groups, the latter case being that of a mixed exchanger.
Read the whole patent
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 June 23, 1994 and granted January 8, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 23, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 23, 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.