Patents by Inventor Bruce Burk

Bruce Burk 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).

  • Leucite-containing porcelains and method of making same
    Patent number: 4101330
    Abstract: A ceramic raw material essentially contains a pre-formed leucite filler which is obtained by reacting alumina, silica and potassium carbonate and/or oxide at a temperature of at least 1149.degree. C, and nepheline syenite. A leucite-nepheline syenite ceramic raw material which is useful as a dental porcelain powder contains 14 percent by weight of sodium-, potassium-, and lithium carbonates and 86 percent by weight of a 5 percent leucite/95 percent nepheline syenite mixture.Upon fusing of the ceramic raw material of the invention, ceramic bodies are formed which have a crystalline leucite phase dispersed in a matrix of a glassy nepheline phase and any other constituents of the ceramic. The leucite provides the ceramic bodies with desirable properties of controlled thermal expansion and high strength.
    Type: Grant
    Filed: September 1, 1976
    Date of Patent: July 18, 1978
    Assignee: The J. M. Ney Company
    Inventors: Bruce Burk, Arthur P. Burnett