N-benzlpiperazines
CA 1074311 A · Owner: Takeda Chemical Industries Ltd. · Inventors: Ishiguro, Toshihiro; Sanno, Yasushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel N-benzylipiperazine derivatives of the general formula (I), wherein R1 and R2 are the the same or different and each stands for a hydrogen atom, an alkylcarbonyl group in which the alkyl moiety contains 1 to 3 carbon atoms or benzoyl; R3 stands for a hydrogen atom a carbamoyl group, benzoyl an alkylcarbonyl group in which the alkyl moiety contains 1 to 3 carbon atoms and which is unsubstituted or substituted by mercapto or morpholino, or an alkyl group containing from 1 to 6 carbon atoms which is unsubstituted or substituted by hydroxy phenyl or aminocarbonyl, represented by the formula wherein each of R4 and R5 is a, hydrogen atom a lower alkyl group having 1 to 3 carbon atoms or a …
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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
- Granted March 25, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 25, 1997.
- 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.