Method for preparing sulphonate salts
CA 2376481 A1 · Owner: Pevere, Virginie · Inventors: Pevere, Virginie; Danerol, Pierre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for preparing sulphonate salts alkaline or alkaline-earth, corresponding to anion of general formula (I): (R-CF¿2?-SO¿3??-¿)¿n? through alkaline hydrolysis of sulphonyl chlorides corresponding to formula (II). The invention is characterised in that it comprises at least a step which consists in alkaline hydrolysis of sulphonyl chloride carried out in the presence of a phase-transfer agent.
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 29, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 29, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 29, 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.