Patents Represented by Attorney Edwin H. Szala

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  • Polymers for use in drilling muds
    Patent number: 5032295
    Abstract: A polymer for use as a deflocculant in drilling muds comprising at least one unsaturated carboxylic acid or its anhydride or salt, at least one unsaturated sulfonic acid or its salt, at least one unsaturated cationic-containing monomer, and optionally, one or more unsaturated non-ionic monomer and/or one mono or di phosphate ester of an unsaturated alcohol.
    Type: Grant
    Filed: April 25, 1989
    Date of Patent: July 16, 1991
    Assignee: National Starch and Chemical Investment Holding Corporation
    Inventors: Gary F. Matz, James C. Long