Azaindenes
CA 2017066 C · Owner: Roberts, David A. · Inventors: Ratcliffe, Arnold H.; Gibson, Keith Hopkinson; Russell, Simon T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns novel azaindenes of the formula I (see formula I), wherein A, together with the adjacent vinylene group of the imidazole moiety completes an azene ring selected from pyridine pyrimidine, pyridazine or pyrazine ring; R1 is (1-8C)alkyl (3-8C)cycloalkyl, (3-8C)cycloalkyl-(1-4C)alkyl phenyl or phenyl(1-4C)alkyl; R2 is, hydrogen (1-4C)alkyl, (1-4C)alkoxy, halogeno, trifluoromethyl cyano, or nitro; R3 and R4 are optional substituents on the said azene ring independently selected from hydrogen, (1-4C)alkyl (3-8C)cycloalkyl, (1-4C)alkoxy, halogeno trifluoromethyl, cyano, hydroxy, hydroxymethyl formyl, and nitro; or when A together with the imidazole moiety to which it is …
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 May 17, 1990 and granted August 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 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.