Patents by Inventor Jean-Michel Brochard

Jean-Michel Brochard has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Preparation of O-alkyl, S,S-dialkylphosphorodithioates
    Patent number: 4950784
    Abstract: The O-alkyl S,S-dialkylphosphorodithioates, e.g., ethoprophos, are facilely prepared, in improved yields and having great purity, by reacting an alkylphosphate dihalogenide, e.g., a dichloride, with a 1.5 to 8 mol excess of a thiol, in the presence of a 0.1 to 5 mol excess of an acid acceptor, with both molar excesses being per mole of said dihalogenide.
    Type: Grant
    Filed: July 24, 1987
    Date of Patent: August 21, 1990
    Assignee: Rhone-Poulenc Agrochimie
    Inventors: Jean-Michel Brochard, Francois Frisou, Pierre Le Roy
  • Process for preparing O-alkyl S-(alpha-branched alkyl) alkylphosphonothioate
    Patent number: 4720565
    Abstract: Process for preparing an O-alkyl S-(alpha-branched alkyl) alkylphosphonothioate of formula: ##STR1## with R and R.sub.1 =alkyl having 1 to 8 C. R.sub.2 =alpha-branched alkyl having 3 to 8 C.It consists in reacting an O-(alkyl)alkylphosphonic acid halide with an alkyl mercaptan HSR.sub.2 in an organic medium, in the presence of an acceptor for acid and a smaller amount of an auxiliary base.Process useful for preparing insecticidal and nematocidal products.
    Type: Grant
    Filed: August 28, 1985
    Date of Patent: January 19, 1988
    Assignee: Rhone-Poulenc Agrochimie
    Inventors: Jean-Michel Brochard, Stanley T. D. Gough