Patents by Inventor Glenn W. Ledder

Glenn W. Ledder 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).

  • Alumina shell molds used for investment casting in directional solidification of eutectic superalloys
    Patent number: 4247333
    Abstract: An alumina investment casting mold has a microstructure characterized by the porous nature of the interconnecting alumina grains which is indicative of alumina-silica molds fired in a reducing atmosphere to remove the silica.
    Type: Grant
    Filed: December 26, 1979
    Date of Patent: January 27, 1981
    Assignee: General Electric Company
    Inventors: Glenn W. Ledder, Wayne D. Pasco, Paul S. Svec