Isonicotinic acid derivatives and related spiro compounds with herbicidal action
CA 2095718 A1 · Owner: Sipido, Victor Karel · Inventors: Sipido, Victor Karel; Van Lommen, Guy Rosalia Eugene; Waespe, Hans-Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Isonicotinic acid derivatives and related furothieno- and, pyrrolo3,4-cpyridin-1(3H)-one -thione and -imine compounds, having formula (a) or (I) wherein R is (b), (c), (d), (e), or (f) Q is O, S or NR7; Y is O, S or NR8; L is COOR9 CONR10R11, C(=S)NR10R11, CN, or a radical of formula (g); the acceptable addition salts, the stereochemically isomeric forms and the N-oxides thereof, having herbicidal properties compositions , containing the same and methods for controlling weeds.
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 November 12, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2013.
- 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.