Patents Represented by Attorney R. B. Harley

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  • Transparent iron oxide pigments
    Patent number: 5004504
    Abstract: In accordance with the instant invention red transparent iron oxide pigment is prepared from yellow transparent iron oxide pigment filter cake by drying and calcining in a single operation using a spray dryer employing a nozzle of the two fluid design.
    Type: Grant
    Filed: February 26, 1990
    Date of Patent: April 2, 1991
    Assignee: BASF
    Inventors: Rodney G. Schroeder, Anand S. G. Sharangpani