Positive inotropically active 4-quinolyl-dihydropyridines
CA 2039684 A1 · Owner: GROß, RAINER · Inventors: GROß, RAINER; Straub, Alexander; STOLTEFUß, JUERGEN
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Positive inotropically active 4-quinolyl-dihydropyridines of the formula, (I), in which, R1 and R5 are identical or different and represent straight-chain or branched alkyl having up to 8 carbon atoms, R2 represents nitro or cyano or, R1 and R2 together form a lactone ring of the formula R3 represents a radical of the formula or, Le A 27 584, in which, R6 - denotes hydrogen halogen or straight-chain or, branched alkyl or alkoxy in each case having up to 8 carbon atoms, R7 denotes aryl, thienyl or pyridyl and, R4 represents hydrogen, or optionally substituted alkyl, alkenyl, alkadienyl or alkynyl, and their physiologically acceptable salts. * * * Le A 27 584
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 April 3, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 2013.
- 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.