Benzofuran derivatives
CA 2068756 A1 · Owner: Cardwell, Kevin S. · Inventors: Pass, Martin; Montana, John G.; Dowle, Michael D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides compounds of the general formula (I): or a physiologically acceptable salt, solvate or metabolically labile ester thereof, wherein, R1 represents a hydrogen atom or a halogen atom or a group selected from C1-6alkyl, C2-6alkenyl, fluoroC1-6alkyl C1-6alkoxy ,-CHO, -CO2H or -COR2;, Ar represents the group ;, R2 represents a gr.oup selected from C1-6alkyl C2-6alkenyl, C1-6alkoxy or the group -NR15R16; R3 represents a group selected from -CO2H -NHSO2CF3 or a C-linked, tetrazolyl group; R4 and R5 which may be the same or different each independently represent a hydrogen atom or a halogen atom or a C1-6alkyl group; Het represents the group, A represents a variety of …
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 15, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 15, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 15, 2014.
- 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.