Process for preparing sulphonylurea salts, new sulphonylurea salts, and their use as herbicides
CA 2032398 A1 · Owner: Schmidt, Robert R. · Inventors: Riebel, Hans-Jochem; Feucht, Dieter; Fest, Christa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing a sulphonylurea salt of the formula, (I), in which, M? represents an alkali metal ion or the counterion formed by protonation, of a basic organic nitrogen compound, R represents halogenoalkyl, R1 represents optionally substituted radicals from the series comprising alkyl, alkenyl, alkinyl ox aralkyl, R2 represents hydrogen, halogen, alkyl halogenoalkyl, alkoxy, halogenoalkoxy, alkylthio halogenoalkyl-, thio, amino, alkylamino or dialkylamino X represents nitrogen or a -CH group, Y represents nitrogen or a -CR3 group where R3 represents hydrogen, halogen, cyano alkyl, formyl, alkyl-carbonyl or alkoxy-carbonyl and, Z represents nitrogen or a -CR4 group where R4 …
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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 December 17, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 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
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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.