Benzimidazole and imidazopyridine derivatives and their application
CA 2088742 C · Owner: Whittaker, Mark · Inventors: Whittaker, Mark; Miller, Andrew
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of general formula I;, wherein: A1 is =N-, =CH- or =CR1-;, A2 is =N-, =CH- or =CR2-; provided that, when one of A1 and A2 is a nitrogen atom the other, of A1 and A2 is other than a nitrogen atom; R represents hydrogen, -C1-C6 alkyl, -C2-C6 alkenyl -C2-C6, alkynyl, halogen or -OC1-C6 alkyl; R1 and R2 each independently represents hydrogen -C1-C6 alkyl, -C2-C6 alkenyl, -C2-C6 alkynyl halogen, -CN, -CO2H, -CO2C1-C6, alkyl, -CONH2 -CHO, -CH2OH, -CF3, -OC1-C6 alkyl, -SC1-C6 alkyl -SOC1-C6 alkyl, -SO2C1-C6 alkyl, -NH2, -NHCOMe or -NO2 or R1 and, R2 together with the carbon atoms to which they are attached form a fused phenyl ring;, R3 represents hydrogen -C1-C6 alkyl, -C2-C6 alkenyl, …
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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
- Filed August 15, 1991 and granted February 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 15, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 15, 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.