Patents by Inventor Frederic B. Jueneman

Frederic B. Jueneman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for purifying phosphoric acid for electrical semiconductor use
    Patent number: 4804526
    Abstract: Phosphoric acid is treated to remove and/or tie up heavy metals and antimony to enable the acid to be used in electrical semiconductor applications by reacting the acid with hydrogen sulfide and with hydrogen peroxide in separate treating steps. The hydrogen sulfide precipitates metal sulfides which are separated from the acid, and the hydrogen peroxide oxidizes dissolved antimony so that it is tied up and does not post-precipitate in the acid after removal of the metal sulfides.
    Type: Grant
    Filed: October 13, 1987
    Date of Patent: February 14, 1989
    Assignee: FMC Corporation
    Inventors: Richard E. Hall, Peter H. Zeh, Frederic B. Jueneman