Pyridine-2,3-dicarboxylic acid diamide derivatives and herbicides comprising said derivatives as active ingredient
CA 2201437 C · Owner: Tonishi, Masanori · Inventors: Ohtsuka, Takashi; Katsuhira, Takeshi; Miura, Yuzo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a pyridine-2 3-dicarboxylic acid diamide derivatives represented by the following formula (I) and herbicides containing them as an active ingredient. (I), wherein R1 represents one to three substituents such as H, halogen, cyano, nitro, (halo)alkyl, (halo)alkoxy (halo)alkylthio, (C3-6)cycloalkyl, alkenyl alkynyl, substituted phenyl, substituted phenoxy etc. and R1 may, represent alkylene or alkenylene together with an adjacent carbon atom; R2 represents H, halogen cyano, nitro, (halo)alkyl or (halo)alkoxy; R3 represents H or alkyl; R4 and R5 each represent H, (halo)alkyl cycloalkyl, substituted cycloalkylalkyl etc.; and n, represents an integer of 0 or 1. The …
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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 April 1, 1997 and granted July 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 1, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 1, 2019.
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