Patents Represented by Attorney Richard F. Keller

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  • Pigment compositions
    Patent number: 6001167
    Abstract: Disclosed are compositions comprising one or more compounds characterized by the formula: ##STR1## wherein each R is independently a hydrocarbyl, hydroxy, hydrocarbyloxy, carboxylic acid, carboxylic acid ester, carboxylic acid amide, sulfonic acid, sulfonic acid amide, imidazolone or nitro group; n is 0, 1 or 2; and M is at least one divalent metal. A process for preparing azo pigment compositions is also disclosed. Paint, ink and plastic compositions containing the foregoing pigments compositions are disclosed.
    Type: Grant
    Filed: August 6, 1996
    Date of Patent: December 14, 1999
    Assignee: Engelhard Corporation
    Inventor: Amrit Bindra