Patents by Inventor Thomas J. Dewees

Thomas J. Dewees 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).

  • Double crucible crystal growing process
    Patent number: 4246064
    Abstract: The disclosure is directed to a double crucible Czochralski crystal semiconductor growing apparatus (10). An inner crucible (14) floats in a melt within an outer crucible (13) and a single crystal semiconductor billet (23) is pulled from the melt (16) in the inner crucible. An elongated tubular member (26), having at least one small aperture (33) in the wall thereof, provides a channel between the outer and inner crucibles. The tubular member (26) permits flow of the melt in the outer crucible (14) to the inner crucible (13) while inhibiting the diffusion of dopant material from the inner to outer crucible while any gas in the member will pass through the aperture (33).
    Type: Grant
    Filed: July 2, 1979
    Date of Patent: January 20, 1981
    Assignee: Western Electric Company, Inc.
    Inventors: Thomas J. Dewees, John S. Fangman, Wen Lin
  • Double crucible crystal growing apparatus
    Patent number: 4190631
    Abstract: The disclosure is directed to a double crucible Czochralski crystal semiconductor growing apparatus (10). An inner crucible (14) floats in a melt within an outer crucible (13) and a single crystal semiconductor billet (23) is pulled from the melt (16) in the inner crucible. An elongated tubular member (26), having at least one small aperture (33) in the wall thereof, provides a channel between the outer and inner crucibles. The tubular member (26) permits flow of the melt in the outer crucible (14) to the inner crucible (13) while inhibiting the diffusion of dopant material from the inner to outer crucible while any gas in the member will pass through the aperture (33).
    Type: Grant
    Filed: September 21, 1978
    Date of Patent: February 26, 1980
    Assignee: Western Electric Company, Incorporated
    Inventors: Thomas J. Dewees, John S. Fangman, Wen Lin