Patents by Inventor John R. Wettlaufer

John R. Wettlaufer 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 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