Patents by Inventor Leonard R. Cullum

Leonard R. Cullum 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).

  • Thyratrons
    Patent number: 4890034
    Abstract: A thyratron includes a grid structure in which a grid element has a plurality of apertures therethrough, each of the apertures comprising two arcuate portions at different distances from the center of the grid which are connected by a radial portion. Thus a large grid area may be provided without detrimentally affecting voltage hold-off, jitter or mechanical soundness.
    Type: Grant
    Filed: June 18, 1987
    Date of Patent: December 26, 1989
    Assignee: English Electric Valve Company Limited
    Inventors: Hugh Menown, Robert E. Baker, Leonard R. Cullum