Patents by Inventor William Andrew Keenan

William Andrew Keenan 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).

  • Semiconductor masking for device fabrication utilizing ion implantation and other methods
    Patent number: 4030942
    Abstract: The disclosure teaches the use of aluminum nitride as a mask for utilization of ion implantation in the formation of semiconductor configurations as well as an underlying material for use in semiconductor lift-off techniques in device formation and the deposition of metallization contact lines and interconnections.
    Type: Grant
    Filed: October 28, 1975
    Date of Patent: June 21, 1977
    Assignee: International Business Machines Corporation
    Inventors: William Andrew Keenan, Charles Thomas Kroll