Patents by Inventor John B. Hedge

John B. Hedge 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 for protecting a graphite chuck for a starter filament in the manufacture of polycrystalline silicon
    Patent number: 5277934
    Abstract: The present invention relates to a method for forming a uniform protective outer coating of pyrolytic graphite on a graphite chuck which is used for supporting a started filament in the manufacture of carbon free polycrystalline silicon.
    Type: Grant
    Filed: November 13, 1991
    Date of Patent: January 11, 1994
    Assignee: Advanced Ceramico Corporation
    Inventors: Michael H. Gilbert, John B. Hedge, Paul J. Walsh