4,7-dihydrothieno2,3-bpyridine derivatives process thereof and agents for cardiovascular diseases
CA 1292991 C · Owner: Shionogi & Co. Ltd. · Inventors: Hiramatsu, Yoshiharu; Adachi, Ikuo; Kawakami, Masaru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Highly effective calcium channel blockers having potent antihypertensive and coronary vasodilating actions ?.?. 4,7-, dihydrothieno2,3-bpyridine derivatives of the formula: wherein R1 is straight or branched chain C1-C4 alkyl alkoxy-, alkyl, or arylalkyl; R2 is hydrogen straight or branched, chain C1-C4 alkyl or alkoxycarbonyl; R3 is hydrogen, straight or branched chain C1-C4 alkyl, phenyl which may be substituted by one or more halogens or alkoxy groups optionally substi-, tuted cycloalkyl, or optionally substituted cycloalkylalkyl; or R2 and R3 taken together may form an alkylene.
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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 December 10, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 10, 2008.
- 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.