Method of producing ethylenediamines
CA 2003449 A1 · Owner: Hino, Youichi · Inventors: Hino, Youichi; Shimasaki, Yuuji; Tsuneki, Hideaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of producing ethylenediamines represented by the general formula, ( I ), wherein R represents a hydrogen atom or a, methyl or ethyl group, which comprises reacting an aziridine compound of the general formula, (II), wherein R is as defined with ammonia in the gaseous phase in the presence of a solid acid catalyst. In another aspect a method of, producing ethylenediamines of the general formula (I) which comprises reacting a reaction product containing an aziridine compound of the general formula (II) obtained, by the gaseous phase intramolecular dehydration reaction of an alkanolamine represented by the general formula (III), wherein X represents the OH group or the NH2 group, Y …
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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 November 21, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 21, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 21, 2011.
- 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.