Pyrazole-glycolic acid amide derivatives
CA 2123499 A1 · Owner: Watanabe, Shigeomi · Inventors: Nawamaki, Tsutomu; Watanabe, Shigeomi; Ishikawa, Kimihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Pyrazole-glycolic acid amides of the following formula (1) (in which R1 to R5 each represent a hydrogen atom or a substituent having a broad definition) and, herbicides containing them. The compounds have a high herbicidal effect against paddy weeds, especially Echinochloa crus-galli, while highly safe for paddy rice plants. (1)
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 November 12, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 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.