S,s-di-(tertiary alkyl) thiophosphonate insecticides
CA 1303625 C · Owner: Stauffer Chemical Company · Inventors: Earhart, Jonathan Philip; Chang, Lydia Lee; Chavdarian, Charles Garabed
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PR-7917A/8185, S,S-DI-(TERTIARY ALKYL) THIOPHOSPHONATE INSECTICIDES Abstract of the Invention, Compounds having the formula in which R is methyl or ethyl, and R1 and R2 are the same or different tertiary alkyl groups each having from 4 to 6 carbon atoms, are insecticides and nematicides especially for control of soil, insects and nematodes. Symmetrical compounds (R1 = R2) may be prepared by reaction of an alkali metal mercaptide with an thiophosphonic dihalide. The alkali metal mercaptide may be prepared by reaction of a tertiary alkyl mercaptan with an alkali metal or alkali metal hydride.
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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
- Granted June 16, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 16, 2009.
- 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.