Herbicidal sulfonamide derivatives
CA 2247398 C · Owner: Chang, Hae Sung · Inventors: Woo, Jae Chun; Hwang, In Taek; Chang, Hae Sung
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 herbicidal sulfonamide derivatives of formula (I) having erythro stereochemistry as herbicides for treatment of preemergence and/or post-emergence, their use and composition as agriculturally suitable herbicides, wherein P and Q, as equivalent or different groups respectively, are CH or N, and present as aromatic ring including P and Q as benzene or pyridine ring; R1 is H, (a) or (b) group wherein Ra is C1C3 alkyl, C1C3 haloalkyl C2C3 alkenyl or C2C3 alkynyl group, wherein Xa is O S, NH or , NRa group; R2 is C1C2 alkyl group; and X and Y are independently halogen atom c1c2 alkyl, C1C2 alkoxy or C1C2 haloalkoxy group.
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 February 27, 1996 and granted July 29, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 2018.
- 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.