Process for the preparation of dialkylaminopropanediol
CA 2060049 A1 · Owner: Aigner, Rudolf · Inventors: Scholz, Hans Jurgen; Mueller, Guenter; Aigner, Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the disclosure Process for the preparation of dialkylaminopropanediol The novel process is based on the reaction of a dialkylamine, preferably dimethylamine or diethylamine with a, monohalopropanediol, preferably monochloropropanediol in, the presence of water. The reaction is carried out in the presence of 25 to 70% by weight of water and at a temperature of 20 to 80°C, the dialkylamine being employed in an amount of at least 2.5 mol per mole of monohalopropanediol. Using the novel process, a high space-time yield and also a high chemical yield of virtually pure dialkylaminopropanediol are obtained.
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 27, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 2014.
- 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.