Certain 2-(2',3',4'-trisubstituted benzoyl)-1,3-cyclohexanediones
CA 2003172 C · Owner: Zeneca Ag Products Inc. · Inventors: Michaely, William J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Herbicidal compounds of the structural formula (see formula I), wherein X is oxygen or sulfur; R is chlorine or bromine; R1 is hydrogen or C1-C4 alkyl; R2 is hydrogen or C1-C4 alkyl; R3 is hydrogen or C1-C4 alkyl; R4 is hydroxy, hydrogen or C1-C4 alkyl; or R3 and R4 together are carbonyl (=0) with the proviso that R1, R2, R5 and R6 are all C1-C4 alkyl; R5 is hydrogen or C1-C4 alkyl; R6 is hydrogen C1-C4 alkyl, C1-C4 alkylthio, or, C1-C4 alkylsulfonyl with the proviso that when R6 is C1-C4 alkylthio or C1-C4 alkylsulfonyl. then R3 and R4 are not together carbonyl; R7 is methyl or ethyl; and R8 is (1) halogen; (2) nitro; or (3) R b SO n- wherein n is the integer 0 or 2; and R b is (a) C1-C3 …
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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 November 16, 1989 and granted January 23, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 16, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 16, 2011.
- 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.