Herbicidal 4-acyl-5-arylisoxazoles
CA 2074155 C · Owner: Rhone-Poulenc Agriculture Limited · Inventors: Cramp, Susan M.; Lambert, Claude; Cain, Paul A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
5-Aryl isoxazole derivatives of general formula (I): wherein:, Ar represents phenyl optionally substituted substituted by one or more groups R2 or pyridyl substituted by one or more groups R2; R represents :-, hydrogen, -CO2R3, -COR4 cyano, halogen, alkyl or haloalkyl;, R1 represents :alkyl, haloalkyl or cycloalkyl;, R2 represents :a halogen atom, R4, nitro, -CO2R3, -OR4 -S(O)m R4, -S(O)m R5, -O-(CH2)p-OR4 or an alkyl group substituted by -OR4; R3 and R4, which may be the same or different each represent alkyl or, haloalkyl;, R5 represents optionally substituted phenyl; p represents an integer from 1 to 3; and m represents zero, 1 or 2;, -the herbicidal properties of these derivatives and …
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 July 17, 1992 and granted October 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 17, 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.