Patents by Inventor Edward M. Hull

Edward M. Hull 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 producing high power semiconductor device using anodic treatment and enhanced diffusion
    Patent number: 4006045
    Abstract: A high power semiconductor device is formed by providing a semiconductor substrate of N.sup.- conductivity, rendering the backside of same porous as by subjecting same to anodic treatment carried out in a concentrated solution of hydrofluoric acid, converting the porous region to an N.sup.+ region, as by arsenic diffusion and forming an active device by conventional techniques in the top surface of the substrate. The method permits usage of high quality N.sup.- substrates and at the same time eliminates the requirement of growing thick epitaxial layers.
    Type: Grant
    Filed: February 13, 1976
    Date of Patent: February 1, 1977
    Assignee: International Business Machines Corporation
    Inventors: Joseph A. Aboaf, Robert W. Broadie, Edward M. Hull, H. Bernhard Pogge
  • High power semiconductor device
    Patent number: 3961353
    Abstract: A high power semiconductor device is formed by providing a semiconductor substrate of N.sup.- conductivity, rendering the backside of same porous as by subjecting same to anodic treatment carried out in a concentrated solution of hydrofluoric acid, converting the porous region to an N.sup.+ region, as by arsenic diffusion and forming an active device by conventional techniques in the top surface of the substrate. The method permits usage of high quality N.sup.- substrates and at the same time eliminates the requirement of growing thick epitaxial layers.
    Type: Grant
    Filed: October 21, 1974
    Date of Patent: June 1, 1976
    Assignee: International Business Machines Corporation
    Inventors: Joseph A. Aboaf, Robert W. Broadie, Edward M. Hull, H. Bernhard Pogge