Benzothiophene derivates as herbicides
CA 2291101 A1 · Owner: Rempfler, Hermann · Inventors: Edmunds, Andrew; De Mesmaeker, Alain; Rempfler, Hermann
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula (I) wherein R1 is C1-C4alkyl C1-C4haloalkyl, C1-C4alkoxy-, C1-C4alkyl C1-C4alkoxycarbonyl, cyano, cyano-C1-C4alkyl hydroxy-C1-C4alkyl, amino-C1-C4alkyl, CHO C1-C4alkyl-ON=CH, C2-C6alkenyl, C1-C4alkoxycarbonyl-C2- C6alkenyl or a group -CH(OR20)OR21; R20 and R21 are each independently of the other C1-C4alkyl; or R20 and R21 together are -(CH2)n1-; n1 is 2 3 or 4; R2 , is hydrogen or C1-C4alkyl; R3 and R4 are each independently of the other hydrogen, C1-C4alkyl or halogen; n is 0 1 or 2; R5 is C1-C4alkyl, C1-, C4haloalkyl C2-C6alkenyl, C2-C6alkynyl, C1-C4alkoxy C1-C4haloalkoxy,C1-, C4alkyl-S(O)n2, (C1-C4alkyl)2NS(O)2 C1-C4alkyl-S(O)2O, halogen, nitro or , cyano; n2 is 0 …
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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 August 18, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 18, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 18, 2020.
- 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.