Picolinic acid derivative, method for preparing the same and herbicidal composition
CA 2066641 C · Owner: Ihara Chemical Industry Co. Ltd. · Inventors: Tamaru, Masatoshi; Saito, Yoshihiro; Tachikawa, Shigehiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is to provide a novel picolinic acid derivative having the formula, (see Formula I) (wherein R is a hydrogen atom, an alkyl group or others R1 and R2 are the same or different, and are an alkyl group, an alkoxy group or others, X is a cyano group a phenoxy group or others, Y is an oxygen atom a sulfur atom or others, and n is 0, or 1) or a salt thereof; a method for preparing the same; and a herbicidal composition containing the same as an active ingredient. The picolinic acid derivative or the salt thereof of the present invention achieves an excellent herbicidal effect at a low dosage, and is effective for controlling the growth of various weeds in a wide range. 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 October 25, 1991 and granted April 1, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 25, 2013.
- 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.