Process for preparing primary amines from aldehydes
CA 2125346 C · Owner: Lust, Ernst · Inventors: Haar, Robert; Hebesberger, Friedrich; Kos, Carlo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for preparing primary amines from aldehydes by mixing an aldehyde with a diluent where in, the case of an alcohol or of water as diluent the mixing temperature is at most 5°C to prevent the formation of the hemiacetal or the aldehyde hydrate and bringing the, mixture into contact with a mixture of ammonia hydrogen, and hydrogenation catalyst, whereby the formation of an imine is prevented, at temperatures of from 60 to 180°C and pressures of from 20 to 60 bar, at least 15 mol of ammonia being used per mol of aldehyde group and also an, apparatus for carrying out the process.
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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 June 7, 1994 and granted December 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 7, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 7, 2016.
- 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.