Patents by Inventor Peter W. Siewert

Peter W. Siewert 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).

  • Pyrometallurgical process for forming tungsten carbide
    Patent number: 5882620
    Abstract: A process for forming a salt, such as sodium tungstate, using a pyrometallurgical operation is provided. A slagging operation is performed in which a metal-containing material is melted in the presence of slag formers such as sodium metasilicate and silica. The metal predominantly reports to a denser metal-containing phase. The denser metal-containing phase may then be subjected to gas sparging with a carbon-containing gas in order to form metal carbide, preferably tungsten carbide.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: March 16, 1999
    Assignee: International Carbitech Industries, Inc.
    Inventors: Jerome P. Downey, Peter W. Siewert