Herbicidal 1,3,5-triazin-2-ylaminocarbonylamino-sulfonylbenzoic esters, the preparation and use thereof
CA 2011987 C · Owner: Hamprecht, Gerhard · Inventors: Mayer, Horst; Westphalen, Karl-Otto; Hamprecht, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1,3,5-Triazin-2-yl)aminocarbonylaminosulfonylbenzoic esters of the general formula I where R1 and R2 are methyl or ethyl, and R3 is hydrogen fluorine or, chlorine, agriculturally useful salts thereof processes for their , manufacture, and their use.
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 March 12, 1990 and granted August 10, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 2012.
- 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.