Sulphonamide herbicides
CA 2022291 A1 · Owner: Hunter, David Calum · Inventors: Newton, Trevor William; Flood, Andrew; Hunter, David Calum
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the formula, (I), in which A is nitrogen or CR5;, R1, R2 and R5 each independently are hydrogen or, halogen, formyl, cyano, carboxy or azido or, optionally substituted alkyl, alkenyl alkynyl, cycloalkyl, alkoxy, alkenyloxy alkynyloxy, aryloxy, alkylthio, alkenylthio alkynylthio, arylthio, alkylcarbonyl, alkoxycarbonyl amino, aminoxy or dialkyliminoxy;, R3 is a hydrogen or optionally substituted alkyl, alkenyl alkynyl, cycloalkyl, heterocyclic, aralkyl or aryl; and R4 optionally substituted alkyl, aralkyl aryl or, heterocyclyl; and salts thereof have herbicidal, properties. The invention also provides processes for their preparation and their use as herbicides.
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 30, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 30, 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.