Patents Represented by Attorney A. C. Ancora

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  • Cement compositions containing set retarders
    Patent number: 4466835
    Abstract: The process of employing as a cement setting retarder a compound which is a derivative of dicyclopentadiene bis(methylamine) wherein at least one amine hydrogen is substituted with a methylenephosphonic acid group or a salt thereof.
    Type: Grant
    Filed: April 18, 1983
    Date of Patent: August 21, 1984
    Assignee: The Dow Chemical Company
    Inventors: Druce K. Crump, David A. Wilson