Manufacture of 3-hydroxypropionitrile
CA 2332155 A1 · Owner: Riegl, Johann · Inventors: Ruettimann, August; Burdet, Bruno; Riegl, Johann
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the production of 3-hydroxypropionitrile comprises (a) reacting acrylonitrile with water in a molar ratio of about 1:0.5 to about 1:20 in the presence of a, weak base under specific temperature and pressure conditions until a conversion in the, range of about 40% to about 80% has been achieved in order to obtain a twophase, organic-aqueous mixture, the organic phase of which consists mainly of bis(cyanoethyl), ether and 3-hydroxypropionitrile as well as a relatively small amount of unreacted, acrylonitrile, and the aqueous phase of which consists mainly of an aqueous solution of the, weak base; (b) after cooling the mixture obtained in (a) separating off its aqueous …
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 24, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 24, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 24, 2023.
- 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.