Patents by Inventor Chad Daniel Marchewka

Chad Daniel Marchewka 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 interaction with a modulated off-axis electron beam
    Patent number: 8018158
    Abstract: An output circuit for a microwave tube is provided that has generally high interaction impedance for good efficiency, has high average power capability, and is physically large for a given operating frequency. The output circuit is designed to operate in conjunction with an off-axis, bunched electron beam. Electromagnetic fields are applied to the region in which the electron beam propagates to impart an azimuthal velocity to the bunched electron beam. The electron bunches then interact synchronously with a resonant output structure to excite radio-frequency modes from which energy can be extracted and applied to a load.
    Type: Grant
    Filed: April 18, 2008
    Date of Patent: September 13, 2011
    Assignee: L-3 Communications Corporation
    Inventors: Richard Donald Kowalczyk, Mark Frederick Kirshner, Craig Bisset Wilsen, Chad Daniel Marchewka
  • METHOD AND APPARATUS FOR INTERACTION WITH A MODULATED OFF-AXIS ELECTRON BEAM
    Publication number: 20080258625
    Abstract: An output circuit for a microwave tube is provided that has generally high interaction impedance for good efficiency, has high average power capability, and is physically large for a given operating frequency. The output circuit is designed to operate in conjunction with an off-axis, bunched electron beam. Electromagnetic fields are applied to the region in which the electron beam propagates to impart an azimuthal velocity to the bunched electron beam. The electron bunches then interact synchronously with a resonant output structure to excite radio-frequency modes from which energy can be extracted and applied to a load.
    Type: Application
    Filed: April 18, 2008
    Publication date: October 23, 2008
    Inventors: Richard Donald KOWALCZYK, Mark Frederick Kirshner, Craig Bisset Wilsen, Chad Daniel Marchewka