Preparation of alkylphosphocholines
CA 2073126 C · Owner: Engel, Juergen · Inventors: Niemeyer, Ulf; Engel, Juergen; Schumacher, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of C14 - C18 alkylphosphocholines comprises reacting an n-alkanol having a chain length of C14 to C18 with phosphorus oxychloride in a single reaction vessel. The product obtained is reacted with a choline salt in the presence of a basic substance without isolation and purification, in an inert solvent to, form a corresponding phosphoric acid diester chloride. The phosphoric acid diester chloride is hydrolyzed to obtain the alkylphosphocholine. Purification of C14 - C18 alkylphosphocholines is performed by adding to a solution of an alkylphosphocholine, in a solvent selected from the group consisting of anhydrous alcohols with 1 to 5 carbon atoms, water and any …
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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 July 3, 1992 and granted September 4, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 3, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 3, 2014.
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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.