Patents by Inventor Charles O. Hulse

Charles O. Hulse 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 increasing impact strength of silicon nitride
    Patent number: 4252860
    Abstract: A method is described for increasing the impact properties of dense silicon nitride articles. The method includes the application of a slurry composed predominately of silicon powder to the surface of the dense silicon nitride article. The slurry coated article is then nitrided at an elevated temperature to partially convert the silicon powder to silicon nitride and to bond the particles together and to the substrate. About 15 to 45 volume percent of the silicon powder is not converted to silicon nitride but remains as elemental silicon.
    Type: Grant
    Filed: July 2, 1979
    Date of Patent: February 24, 1981
    Assignee: United Technologies Corporation
    Inventors: John J. Brennan, Francis S. Galasso, Charles O. Hulse