1,4-dihydropyridines
CA 2045678 A1 · Owner: Fray, Michael J. · Inventors: Cooper, Kelvin; Fray, Michael J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
2045678 9011280 PCTABScor01, The invention provides compounds of formula (I) and the pharmaceutically acceptable salts thereof wherein R is an optionally, substituted thienyl benzothienyl, furyl, benzofuranyl, pyridinyl quinolinyl or isoquinolinyl group; either R1 and R2 are each independently H or C1-C6 alkyl; or R1 and R2 taken, together with the nitrogen atom to which they are attached form a, pyrrolidinyl, piperidinyl, morpholinyl piperazinyl, N'-(C1-C4, alkyl)piperazinyl or N'-(C2-C4 alkanoyl)piperazinyl group; or R1 is H or C1-C4 alkyl and R2 is cyano C3-C7, cycloalkyl, aryl, heteroaryl or a C1-C4 alkyl group substituted by up to 2 substituents each independently selected from C3-C7 …
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 February 22, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 22, 2012.
- 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.