Method for making aqueous solutions of unsaturated quaternary ammonium salts
CA 2368879 A1 · Owner: Grosius, Paul · Inventors: Riondel, Alain; Grosius, Paul; Herbst, Gilles
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 making an aqueous solution of unsaturated quaternary ammonium salts of formula (I) by reacting, in the presence of water, N,N-dimethylaminoethyl acrylate with a quaternizing agent of formula (II):R-Cl. Said method is characterised in that it consists in: carrying out said reaction continuously in a tubular reactor introducing the quaternizing agent at the reactor base and introducing N,N-dimethylaminoethyl acrylate and water at the top of the reactor said reaction being carried out at a temperature between 35 to 60 ·C and under pressure of 10-20 bars. R = methyl or benzyl radical.
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 January 20, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 20, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 20, 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.