Patents by Inventor Robert W. Marks

Robert W. Marks 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).

  • Technique for making asymmetric thyristors
    Patent number: 4264383
    Abstract: A method for doping a wafer of n-type seimiconductor material having two surfaces includes the steps of applying a boron solution to a first surface of the wafer and heating the wafer to drive the boron into the semiconductor wafer for forming a first p-type region. Both surfaces of the wafer are then exposed to a gallium vapor for forming a second p-type region on the second surface and deepening the extent of the first p-type region.
    Type: Grant
    Filed: August 23, 1979
    Date of Patent: April 28, 1981
    Assignee: Westinghouse Electric Corp.
    Inventors: John A. Ostop, Robert W. Marks