Benzenesulfonylurea derivatives
CA 2107235 C · Owner: Kim, Jin-Seog · Inventors: Kim, Jin-Seog; Ko, Young Kwan; Ku, Dong Whan
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 novel benzenesulfonylurea derivatives having a herbicidal activity, which is described in the structure of general formula (I), wherein RI is H C1-C3 alkyl, C1-C3 haloalkyl, halogen, CN NO2, C1-C3 alkoxy, C1-C3, haloalkoxy, SO2NRIRII C1-C3 alkylthio, C1-C3 alkylsulfinyl, C1-C3 alkylsulfonyl,: SCH2F NH2, NHCH3, N(Me)2, C1-C2, alkyl substituted with C1-C2 alkoxy C1-C2 haloalkoxy, SH, SCH3, CN or OH, or CO2RIII; and then RI is H C1-C4 alkyl, C2-C3 cyanoalkyl, methoxy or ethoxy; RII is H C1-C4 alkyl, C3-C4 alkenyl, or when taken together connecting RI and RII -(CH2)3-, -(CH2)4-, -(CH2)5- or CH2CH2OCH2CH2may be formed; RIII is C1-C4 alkyl, C3-C4 alkenyl C3-C4 …
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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 March 9, 1992 and granted November 4, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 9, 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.