Two-stage process for the production of 1,3-propanediol by catalytic hydrogenation of 3-hydroxypropanal
CA 2339503 A1 · Owner: Hofen, Willi · Inventors: Jaeger, Bernd; Sauer, Joerg; Hofen, Willi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A two-stage process for producing 1,3-propanediol by first hydrogenating at a temperature of 30 ~C to 80 ~C in the presence of an oxide-supported metal hydrogenation catalyst. Second, the resulting reaction solution is hydrogenated at a temperature of 80 ~C to 180 ~C to a 3-hydroxypropanal conversion of substantially 100 % in the presence of an activated carbonsupported metal hydrogenation catalyst.
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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 September 1, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 1, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 1, 2021.
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Timeline
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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.