Patents by Inventor Davis K. Hartman

Davis K. Hartman 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).

  • Process for thermal gradient zone melting utilizing a beveled wafer and a beveled guard ring
    Patent number: 4168992
    Abstract: A wafer of semiconductor material processed by thermal gradient zone melting is supported by a beveled inner peripheral surface defining an aperture in a guard ring to minimize the distortion of the thermal gradient at the outer peripheral edge surface of the wafer.
    Type: Grant
    Filed: December 7, 1978
    Date of Patent: September 25, 1979
    Assignee: General Electric Company
    Inventors: Thomas R. Anthony, Harvey E. Cline, Davis K. Hartman, Mike F. Chang