Patents by Inventor Dwight S. Whittemore

Dwight S. Whittemore 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).

  • Carbon-containing carbon bonded refractories with improved physical properties
    Patent number: 5318933
    Abstract: Carbon-containing carbon bonded refractory mixes and products made therefrom in which the refractory is a magnesite or high alumina aggregate and containing a silica-free elemental boron containing B-Mg-O alloy powder containing at least 95% B-Mg-O. and shapes made therefrom. The invention also involves the method of increasing the lining life of a metallurgical vessel utilizing unburned brick made from the above-noted mixes.
    Type: Grant
    Filed: March 24, 1993
    Date of Patent: June 7, 1994
    Assignee: Indresco Inc.
    Inventors: David R. Sundell, Dwight S. Whittemore
  • Insulating refractory
    Patent number: 5252526
    Abstract: A refractory mix for forming high strength, low thermal conductivity refractory shapes comprising from about 40 to 75% by weight of at least one dense refractory aggregate, about 10 to 30% by weight of a bonding agent, and about 5 to 25% by weight of hollow ceramic microspheres having a diameter of about 1 to 350 microns.
    Type: Grant
    Filed: September 30, 1991
    Date of Patent: October 12, 1993
    Assignee: Indresco Inc.
    Inventor: Dwight S. Whittemore
  • Burned high purity refractories with low soluble chromium
    Patent number: 5219807
    Abstract: A burned, high-purity refractory, specifically a chrome-alumina, alumina-chrome and picrochromite composition, which contains less than 5 ppm total soluble chromium. Such products are obtained by adding to the starting mix less than 5 wt. % (often less than 3 wt. %) zircon, titania, molybdic oxide, boric acid, carbon black, or silica.
    Type: Grant
    Filed: June 27, 1991
    Date of Patent: June 15, 1993
    Assignee: Indresco Inc.
    Inventors: Stanley R. Pavlica, Dwight S. Whittemore
  • Alumina-carbon compositions and slidegate plates made therefrom
    Patent number: 5214010
    Abstract: A refractory composition consisting essentially of, for each 100 wt. % thereof, about 40 to 80 wt. % of an alumina, about 5 to 30 wt. % of a zirconia-containing grain, about 2 to 10 wt. % of a carbon, and about 1 to 12 wt. % of an oxidation and erosion resistance additive, the method of making refractory shapes utilizing such composition, and the resultant shapes.
    Type: Grant
    Filed: June 10, 1992
    Date of Patent: May 25, 1993
    Assignee: Indresco, Inc.
    Inventor: Dwight S. Whittemore
  • Spall resistant chrome-alumina refractory brick
    Patent number: 4792538
    Abstract: An chrome-alumina refractory brick prepared by pressing and firing a mixture consisting essentially of about 15 to 90 percent by weight of a fused chrome-alumina grain, 5 to 25 percent by weight of chromic oxide, up to 30 percent by weight of a zirconia-containing grain, and the balance alumina.
    Type: Grant
    Filed: September 30, 1987
    Date of Patent: December 20, 1988
    Assignee: Dresser Industries, Inc.
    Inventors: Stanley R. Pavlica, Dwight S. Whittemore
  • Slide Gates
    Patent number: 4506022
    Abstract: High alumina slide gate compositions comprising aluminous grain, carbonaceous material, high purity alumina, silicon metal and resin.
    Type: Grant
    Filed: September 16, 1983
    Date of Patent: March 19, 1985
    Assignee: Dresser Industries, Inc.
    Inventors: Dwight S. Whittemore, David J. Michael