Method of preparing quaternary trialkanolamine ester salts
CA 2256450 A1 · Owner: Ahrens, Hartmut · Inventors: Bergfeld, Manfred; Carstens, Axel; Ahrens, Hartmut
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described is a method of preparing quaternary trialkanolamine ester salts or formula (I) in which X- is the anion of an inorganic or organic acid Ra is a , C1-C4 alkyl group; Rb and Rc independently of each other, are a C1-C3 alkylene group and Rd is a saturated and/or unsaturated aliphatic C1-C22 carboxylic acid group, m, n, p and q are whole numbers m being 1 to 3, n , being 0 to 3, p being 0 to 1 m+n+p being equal to 4 and q being 1 or when m , = 3, n = 0 and p = 1, q is 2. The method calls for a quaternary compound of formula (II), in which X-, Ra, Rb, Rc, m n, p and q are as defined above, to , be esterified in the presence of an oxyacid of phosphorus and/or one of its …
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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 June 6, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 6, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 6, 2019.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.