Patents by Inventor James Walter Gewartowski

James Walter Gewartowski 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).

  • Parametrically-stable negative resistance diode circuit
    Patent number: 4028637
    Abstract: A parametrically-stable microwave circuit comprises in cascade a negative resistance diode, a stabilizing network, and a complementary type filter. The complementary type filter presents a substantially constant impedance to the stabilizing network from low frequencies to the operating frequency by selectively coupling the diode microwave signals to a dummy load or to a circuit load. With its termination thus controlled, the stabilizing network may be designed to suppress spurious parametric oscillations by presenting to the negative resistance diode a predetermined impedance over a broad range of frequencies.
    Type: Grant
    Filed: June 14, 1976
    Date of Patent: June 7, 1977
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: James Walter Gewartowski, William Edward Schroeder