Patents Represented by Attorney Phillip D. Shepherd

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  • Method for the froth flotation of coal
    Patent number: 4820406
    Abstract: The froth flotation of coal is conducted in the presence of an epoxide conditioner.
    Type: Grant
    Filed: May 6, 1987
    Date of Patent: April 11, 1989
    Assignee: The Dow Chemical Company
    Inventors: Robert D. Hansen, Richard R. Klimpel