Patents by Inventor Charles W. Keller

Charles W. Keller 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).

  • Method of manufacturing fused-magnesia
    Patent number: 5965102
    Abstract: Undersize particles are recovered from a conventional manufacturing process commonly employed to prepare fused magnesia crystals. The recovery hydrolizes a bulk mass of the collected undersize particles causing fracture to eventually occur in the bulk mass and thereafter fuses the agglomerated material in an electric arc furnace.
    Type: Grant
    Filed: November 24, 1997
    Date of Patent: October 12, 1999
    Inventors: Harry B. Shimp, Charles W. Keller, Steve M. White
  • Method for preparation of fused magnesia particulates
    Patent number: 5926499
    Abstract: A fused magnesia ingot being discharged from an electric furnace at extremely elevated temperatures is thermally insulated to improve product yield. Thermal insulation provided with a blanket covering of refractory material can be used for this purpose.
    Type: Grant
    Filed: July 21, 1998
    Date of Patent: July 20, 1999
    Inventors: Harry B. Shimp, Jr., Steven M. White, Charles W. Keller