Patents by Inventor Ronald Kurzeja

Ronald Kurzeja 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).

  • Sintered alloy dental prosthetic devices and method
    Patent number: 4828495
    Abstract: This invention relates to biomechanical devices comprising a liquid sinterable metallic alloy, characterized by a multiphase, composite microstructure of isolated spherical grains approximately 50 microns in diameter distributed in an essentially nonporous matrix. The dental prosthetic devices include full-cast crowns, copings, pontics, inlays, onlays, and bridges. Other devices include reconstructive and orthopedic pieces. A method for fabricating a dental prosthetic device is also recited.
    Type: Grant
    Filed: October 28, 1986
    Date of Patent: May 9, 1989
    Assignee: Denpac Corp.
    Inventors: A. Milton Bell, Murray G. Gamberg, Ronald Kurzeja
  • High strength porcelain dental prosthetic device
    Patent number: 4671770
    Abstract: A high strength porcelain dental prosthetic device, such as an infrastructure, inlay or onlay is formed directly from a dental porcelain fired at elevated temperatures of about 1000.degree. F. and above, under a pressure of about 10 to 1000 microns of Hg. A special furnace is devised which will achieve this pressure range in a rapid efficient manner. The resultant porcelain dental infrastructure has a high density, and the strength approaching that found in commercial cast ceramic restorations.
    Type: Grant
    Filed: November 26, 1984
    Date of Patent: June 9, 1987
    Assignee: Denpac Corp.
    Inventors: A. Milton Bell, Murray G. Gamberg, Ronald Kurzeja
  • Vacuum sintered powder alloy dental prosthetic device and oven to form same
    Patent number: 4661071
    Abstract: An alloyed metal dental prosthetic device, such as a coping, of an alloy dental reconstructive element, is formed from a liquid phase sintered powdered metal alloy at elevated temperatures of about 1000.degree.-1300.degree. C. under a high level of vacuum of about 10 to 1000 microns of Hg. A special oven is devised which will achieve this high level of vacuum in a rapid efficient manner. The resultant metal prosthetic device has the density of at least that found in commercial cast prosthetic devices.
    Type: Grant
    Filed: June 21, 1984
    Date of Patent: April 28, 1987
    Assignee: Denpac Corp.
    Inventors: A. Milton Bell, Murray G. Gamberg, Ronald Kurzeja
  • Protective coating for graphite electrodes
    Patent number: 3964924
    Abstract: A coating composition for the protection of graphite electrodes comprising a water dispersion of the following ingredients based on total solids: 35 to 65 percent oxide-coated particulate silicon, 15 to 40 percent colloidal silica, 2 to 10 percent powdered carbon and 5 to 20 percent ground glass.
    Type: Grant
    Filed: July 11, 1975
    Date of Patent: June 22, 1976
    Assignee: Pfizer Inc.
    Inventor: Ronald Kurzeja