Patents by Inventor Fred J. Waldmann

Fred J. Waldmann 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).

  • Cryogenic treatment of silicon nitride tool and machine parts
    Patent number: 6164079
    Abstract: This disclosure describes a cryogenic process for increasing the life of silicon nitride tool materials such as machining inserts used in the high-speed machining of cast irons and other materials. The process entails placing the tools in a cryogenic chamber where the temperature is lowered to about -320.degree. F. and held at that level for a period of time and then raised to ambient temperature. Both the lowering and raising of the temperature are at specifically controlled rates.
    Type: Grant
    Filed: July 28, 1999
    Date of Patent: December 26, 2000
    Inventors: Christian Clark Waldmann, Fred J. Waldmann
  • Cryogenic and heat process for treating sintered carbide metals to increase service life
    Patent number: 6141974
    Abstract: This disclosure relates to a process for treating sintered carbide metals, typically cutting tools and parts subject to high abrasive and corrosive wear, to enhance their service life. The process involves exposing the items to be treated to gaseous nitrogen for various periods of time with subsequent elevated heat treatment.
    Type: Grant
    Filed: May 26, 1999
    Date of Patent: November 7, 2000
    Inventors: Christian Clark Waldmann, Fred J. Waldmann