Patents by Inventor Franciscus N. A. Kerstens

Franciscus N. A. Kerstens 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).

  • Magnetron having a filter on the output probe
    Patent number: 4371848
    Abstract: A simple but effective filter attenuating one or more frequencies other than the fundamental frequency of a magnetron is provided in the magnetron. The filter comprises one or more stubs each of which extends along one side of an output probe connected to an anode vane of the magnetron. Each stub forms a slot which has an effective electrical length of a quarter wavelength at the frequency to be attenuated by the filter. The probe may be a metal strip and the stub, may be a lug formed by cutting in the strip a mainly longitudinal slot which opens into a side edge of the strip.
    Type: Grant
    Filed: September 29, 1980
    Date of Patent: February 1, 1983
    Assignee: U.S. Philips Corporation
    Inventors: Egbert B. G. W. Gotje, Franciscus N. A. Kerstens
  • Resonant cavity magnetron with choke structure for reducing harmonics in output system
    Patent number: 4129834
    Abstract: Disclosed is a magnetron with a folded 1/4.lambda. choke for suppression of higher harmonics formed by three coaxial conductors, the inner one of which is connected to the output probe of the magnetron.
    Type: Grant
    Filed: November 14, 1977
    Date of Patent: December 12, 1978
    Assignee: U.S. Philips Corporation
    Inventor: Franciscus N. A. Kerstens