Patents by Inventor Fred A. Feulner

Fred A. Feulner 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 and apparatus for reducing noise in crossed-field amplifiers
    Patent number: 4082979
    Abstract: Noise in reentrant-stream crossed-field amplifiers is suspected of being generated by electrons re-entering the interaction region with large amplitude cycloidal motion near the slow-wave circuit. Means to increase the electric field in a portion of the drift region preceding the circuit lowers the noise, presumably by collecting these electrons. The field may be increased by decreasing the spacing between cathode and drift electrode or by applying a bias voltage on an insulated electrode.
    Type: Grant
    Filed: September 29, 1976
    Date of Patent: April 4, 1978
    Assignee: Varian Associates, Inc.
    Inventors: George K. Farney, Fred A. Feulner