Halogen-containing compounds, herbicidal composition containing the same as an active ingredient, and intermediary compounds therefor
CA 2047597 A1 · Owner: Endo, Keiji · Inventors: Kawaguchi, Shinji; Higurashi, Rika; Watanabe, Michi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Halogen-contianing compounds represented by the formula, .... (I), wehrein, X represents a halogen atom W represents an oxygen atom, sulfur atom or group -OCH2-, Z1 and Z2 each represent a nitrogen atom or group CH, but when Z1 is a nitrogen atom Z2 represents, nitrogen atom or group CH and when Z1 is a group CH Z2 represents a nitrogen atom, R1 and R2 each independently represent either a hydrogen atom, halogen atom or mono- or dilower alkyl-substituted amino, or a lower alkyl lower alkoxy, or lower alkylthio each of which may be substituted with a halogen atom, R3 and R4 each independently represent a hydrogen atom, halogen atom, hydroxycarbonyl lower, alkoxycarbonyl, lower alkyl, lower …
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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 July 23, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 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.