Process for producing a heterocyclic tertiary amine
CA 2068004 A1 · Owner: Nissan Chemical Industries Ltd. · Inventors: Tanaka, Norio; Hatanaka, Masataka; Watanabe, Yoshihisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing a heterocyclic tertiary amine of the formula (III):, (III), wherein A is a nitrogen atom or C-R5 B is a nitrogen, atom or C-R6, is a single bond or a double bond and, each of R1, R2, R3, R4, R5 and R6 which may be the same or different, is a hydrogen atom , an acyl group a halogen, atom, a cyano group, etc. provided that two of R1 R2, R3 and R4 may together form a 3-membered 4-membered, 5-, membered or 6-membered aliphatic ring a heterocyclic, ring or aromatic ring, and R7 is a C1-6 alkyl group which may be substituted, etc. which process comprises reacting a heterocyclic secondary amine of the formula (I):, (I), wherein A, B, , R1, R2, R3 and R4 are as defined …
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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 May 5, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 5, 2014.
- 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.