Patents by Inventor John Frederick Krueger

John Frederick Krueger 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).

  • Transmission mode photocathode sensitive to ultraviolet light
    Patent number: 5697826
    Abstract: A photocathode which is responsive to ultraviolet light to release photoelectrons includes a supportive window layer of sapphire and a single-crystal active layer of AlGaN. Interposed between the window layer and the active layer is an interface layer which insures a low population density of crystalline defects at the interface of the interface layer with the active layer and in the active layer itself. Consequently, the photocathode is an effective emitter of photoelectrons in the transmission mode.
    Type: Grant
    Filed: July 9, 1996
    Date of Patent: December 16, 1997
    Assignee: Litton Systems, Inc.
    Inventors: Hyo-Sup Kim, John Frederick Krueger, Alexander Lackey Vimson