Patents by Inventor Russeli L. Yeckley

Russeli L. Yeckley 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).

  • Whisker-reinforced ceramic containing aluminum oxynitride and method of making the same
    Patent number: 7309475
    Abstract: A process of making aluminum oxynitride powder including the steps of: forming a powder mixture by mixing alumina powder and aluminum nitride powder according to the following formula: ((4?x)/3) alumina and x aluminum nitride wherein x is in mole percent and ranges between about 0.31 and about 0.61; adding between about 0.1 mole percent and about 1.0 mole percent of pure aluminum powder to the powder mixture; and reacting the powder mixture containing aluminum at a temperature between about 1600° C. and about 1900° C. for a duration between about 2 hours and about 24 hours in a flowing nitrogen atmosphere so as to form aluminum oxynitride.
    Type: Grant
    Filed: April 26, 2006
    Date of Patent: December 18, 2007
    Assignee: Kennametal Inc.
    Inventors: Russeli L. Yeckley, Shanghua Wu