Patents by Inventor Masakazu Fukushima

Masakazu Fukushima 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).

  • Electron guns for use in cathode ray tubes
    Patent number: 4178532
    Abstract: In a unipotential type electron gun including a main lens constituted by three coaxial and spaced apart electrodes for focusing an electron beams, the length of the intermediate electrode is made to be larger than 1.1D, where D represents the inner diameter of the electrodes on both sides, and the sum of the length of one electrode located on the side of a cathode electrode, the length of the intermediate electrode, the gap length therebetween, and the gap length between the intermediate electrode and the electrode on the opposite side is set to be in a range of from 4.0D to 5.4D.
    Type: Grant
    Filed: October 19, 1977
    Date of Patent: December 11, 1979
    Assignee: Hitachi, Ltd.
    Inventors: Kenichi Fukuzawa, Kunio Ando, Masakazu Fukushima