Preparation of solutions of betane
CA 2299782 A1 · Owner: Waller, Francis Joseph · Inventors: Waller, Francis Joseph; Carroll, William Eamon; Ramprasad, Dorai
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Betaine is produced by the oxidation of a choline salt in the presence of a base, and a supported noble metal catalyst at temperatures from about 20°C to 100°C and, pressures from atmospheric to about 100 psi. This process is advantageous over prior, processes for the production of betaine in that no amine halocarboxylate contaminants, are produced by this reaction.
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 February 28, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 28, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 28, 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.