Sulphonamide herbicides
CA 2086086 A1 · Owner: Newton, Trevor William · Inventors: Newton, Trevor William
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 CR7;, R1, R2 and R7 each independently are hydrogen 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 hydrogen or optionally substituted alkyl, alkenyl alkynyl, cycloalkyl, heterocyclic, aralkyl or aryl; R4 is hydrogen or optionally substituted alkyl alkenyl, aralkyl, aryl, heterocyclic or acyl; and R5 and R6 each independently are hydrogen or optionally substituted alkyl, alkoxy, alkenyl, alkynyl aryl, aralkyl, amino, …
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 December 22, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 22, 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.