Optical active 1,4-dihydropyridine compounds as bradykinin antagonists
CA 2245041 A1 · Owner: Ikeda, Takafumi · Inventors: Kawamura, Mitsuhiro; Ikeda, Takafumi; Ge, Yu-Ting
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides a compound of the forrnula ( I): <see fig. 1>, and its pharmaceutically acceptable salts wherein A1 and A2 are each halo; R1 and R2 are independently C1-4 alkyl; R3 is substituted or unsubstituted phenyl or naphthyl; Y, is heterocyclic group selected from C5-10 azacycloalkyl C6-l0 diazacycloalkyl, C7-10, azabicycloalkyl and the like; and R4 is selected from (a) substituted or unsubstituted C1-8 alkyl; (b) substituted or unsubstituted amino; (c) substituted or unsubstituted C2-6 alkanoyl; (d) substituted or unsubstituted C3-8 cycloalkyl or C7-14 bicycloalkyl; (e) substituted or unsubstituted C5-10 azacycloalkyl or C6-10 diazacycloalkyl and (f), substituted or …
Read the whole patent
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 August 14, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 14, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 14, 2020.
- 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.