Process for preparing betaines
CA 2380856 A1 · Owner: Carstens, Axel · Inventors: Carstens, Axel; Broucek, Reinhard; Blaufelder, Christian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for preparing betaines of formula (I) wherein R1 represents a C1-C24 hydrocarbon group and R2 and R3 independently , represent a C1-C3 hydrocarbon group comprising reacting an aqueous solution of an ethoxylated quaternary ammonium compound of formula (II) wherein R1 R2, and R3 have the same meaning as described above and X.macr. represents a suitable anion, with oxygen or an oxygen-containing gas under alkaline conditions in the presence of a supported and promoted Pt catalyst at a temperature ranging from room temperature to 70~C. Preferably use is made of , a Pt/Bi/C catalyst. The invention process is particularly suitable for converting choline …
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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 6, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 6, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 6, 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.