1-biphenylimidazole derivatives, their preparation and their therapeutic use
CA 2229000 C · Owner: Shimoji, Yasuo · Inventors: Koike, Hiroyuki; Kanazaki, Takuro; Sada, Toshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula (I):, wherein, preferably R1 represents an ethyl, propyl or, butyl group; R2 represents a hydrogen atom or a methyl group; R3 represents a hydrogen atom; R4 represents a hydrogen atom or a methyl group; R5 represents a group of formula -COOR5a, in which R5a represents a hydrogen atom a, pivaloyloxymethyl group, an ethoxycarbonyloxymethyl group a 1-(ethoxy-carbonyloxy)ethyl group, an isopropoxycarbonyloxymethyl group, a 1-(isopropoxycarbonyloxy)ethyl group, a (5-methyl-2-oxo-1,3-dioxolen-4-yl)methyl group or, a phthalidyl group; R6 represents a hydrogen atom; R7 represents a carboxy group or a tetrazol-5-yl group at the 2-position of the benzene ring; and the benzene …
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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 February 20, 1992 and granted April 9, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 20, 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.