Pyridazinone derivatives
CA 1252788 A · Owner: Smith Kline & French Laboratories Limited · Inventors: Coates, William J.; Emmett, John C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the formula (I) . (I) and pharmaceutically acceptable salts are described wherein R1 is hydrogen or methyl; R2 and R3 are independently hydrogen, C1-6alkyl, C2-6alkenyl C2-6alkynyl, phenyl(C1-6)alkyl, or phenyl; or R2 and R3 together with the carbon atoms to which they are joined form a C5-6 cycloalkyl ring; and Y is sulphur or a group -NR4- wherein R4 is hydrogen, C1-6alkyl or phenyl(C1-6)alkyl. These compounds have inotropic vasodilator, broncho-, dilating and platelet aggregation inhibiting properties. Pharmaceutical compositions are described as are methods of use. Intermediates and processes for the preparation of the compounds of the formula (I) are described.
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
- Granted April 18, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 18, 2006.
- 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.