Patents by Inventor Thomas P. Clement, II

Thomas P. Clement, II 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 the recovery and separation of arsenic from antimony
    Patent number: 5110353
    Abstract: Fume generated by roasting speiss is contacted with an oxygen-containing gas at an elevated temperature for a sufficient time to product arsenic and antimony products which may be separated from each other by means such as condensation. Further, in the roasting of antimony-containing phases (such as speiss) the presence of arsenic can enhance the volatility of the antimony.
    Type: Grant
    Filed: January 29, 1991
    Date of Patent: May 5, 1992
    Assignee: ASARCO Incorporated
    Inventors: Taie Li, Thomas P. Clement, II, John P. Hager
  • Process for treating speiss
    Patent number: 4891061
    Abstract: Arsenic and antimony are separated from speiss by a roasting operation employing pyrite and coke and the arsenic is separated from the resultant product by a water pressure leaching operation.
    Type: Grant
    Filed: April 21, 1986
    Date of Patent: January 2, 1990
    Assignee: ASARCO Incorporated
    Inventors: Thomas P. Clement, II, John R. Wettlaufer, Jack A. Scott
  • Process for the recovery and separation of arsenic from antimony
    Patent number: 4808221
    Abstract: Fume generated by roasting speiss is contacted with an oxygen-containing gas at an elevated temperature for a sufficient time to produce arsenic and antimony products which may be separated from each other by means such as condensation. Further, in the roasting of antimony-containing phases (such as speiss) the presence of arsenic can enhance the volatility of the antimony.
    Type: Grant
    Filed: August 25, 1987
    Date of Patent: February 28, 1989
    Assignee: Asarco Incorporated
    Inventors: Thomas P. Clement, II, Taie Li, John P. Hager