Patents by Inventor Keiji Yanai

Keiji Yanai 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).

  • Cathode ray tube apparatus with quadrupole electrode structure
    Patent number: 4886999
    Abstract: A cathode ray tube apparatus comprises three cathodes arranged in line with each other in a first direction for emission of respective electron beams therefrom, a focusing electrode having first to third apertures defined therein for the passage of the respective electron beams therethrough, a quadrupole electrode structure including first to third quadrupole electrodes one for each electron beam, each of the quadrupole electrode being comprised of a pair of horizontal electrode pieces spaced a predetermined distance from each other in a second direction perpendicular to the first direction and positioned upwardly and downwardly, respectively, with respect to the associated electron beam, and a pair of vertical electrode pieces spaced a predetermined distance from each other in a direction aligned with the first direction and positioned leftwards and rightwards with respect to such associated electron beam, and a power source circuit for applying a predetermined voltage to the quadrupole electrode structure.
    Type: Grant
    Filed: January 11, 1989
    Date of Patent: December 12, 1989
    Assignee: Mitsubishi Denki Kabushiki Kaishi
    Inventors: Hisakazu Yamane, Ritsuo Ishida, Hisao Nakanishi, Keiji Yanai, Masayuki Toshiyasu, Kazunori Ikegami, Soichiro Okuda, Kenji Kimura, Koji Ishibata, Yoshinori Ishii