Chemical compounds
CA 2003690 A1 · Owner: Coates, William J. · Inventors: Kruse, Lawrence I.; Coates, William J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the formula (1) : (1), and pharmaceutically acceptable salts thereof are described wherein R1 is C1-6alkyl, C2-6alkenyl C3-5-, cycloalkyl C1-4alkyl, phenylC1-4alkyl or C1-4alkyl substituted by 1 to 6 fluoro groups; R2 is hydrogen C1-6alkyl, C1-6-, alkylthio, C1- 6alkoxy nitro or -NR3R4; and R3 and R4, are independently hydrogen or C1-4 alkyl optionally substituted by hydroxy provided that the carbon atom adjacent to the nitrogen atom is not substituted by hydroxy; with the proviso that R1 is not methyl or ethyl when R2 is hydrogen. Processes for their preparation pharmaceutical, compositions containing them and their use as medicaments 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
- Filed November 23, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 23, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 23, 2011.
- 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.