Process for producing 1,2,4-butanetriol
CA 2322480 A1 · Owner: Daiso Co. Ltd. · Inventors: Pu, Shu-Bin; Ikai, Kousei; Mikami, Masafumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing 1,2,4-butanetriol safely easily, and inexpensively , without posing a problem concerning wastewater. At least one of a malic diester, 3-hydroxy-.gamma.-butyrolactone and a 3,4-dihydroxybutanoic ester , respectively represented by formulae (I) is reduced with sodium boron hydride in an organic solvent to obtain 1,2,4-butanetriol represented by formula , (II). When optically active isomers are used as the starting compounds substantially no racemization occurs during the reduction and optically active 1,2,4-butanetriol is 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 February 25, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 25, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 2021.
- 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.