Novel thiophenesulfonylurea derivatives and herbicidal composition containing the same
CA 2175819 A1 · Owner: Yun, Kyeong Yeol · Inventors: Lee, Yeon Soo; Kim, Dae Whang; Yun, Kyeong Yeol
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a thiophenesulfonylurea derivative represented by general formula (I), the process for preparation thereof and , herbicide using it; and a salt thereof in which T represents a group T1, T2, or T3 having general formula (a) wherein E represents a direct bond; R represents hydrogen or C1-4 acyl; R1 represents C1-6 alkyl substituted with 1 to 3 halogen atoms; R2 represents hydrogen C1-3 alkyl, C1-3 haloalkyl, halogen, cyano C1-3 alkoxy, C1-3 haloalkoxy, amino, methylamino dimethylamino, or C1-2 alkyl substitued with C1-2 alkoxy C1-2 haloalkoxy, thiol, methylthio, cyano or hydroxy; A represents a group selected from A1 to A4 having general formulae (b), and …
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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 November 9, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 9, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 9, 2016.
- 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
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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.