Sulfonylureas
CA 2101488 A1 · Owner: Schurter, Rolf · Inventors: Schurter, Rolf; Fory, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel sulfonylureas, Abstract:, N-Pyridylsulfonyl-N'-pyrimidinylureas of formula I (1), wherein, R1 is methyl or methoxy and R2 is hydrogen or methyl;, and the salts of those compounds with amines alkali metal or alkaline earth metal bases or with quaternary ammonium bases, have good pre- and post-emergence selective herbicidal and growth-regulating properties.
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 28, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 28, 2015.
- 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.