Patents by Inventor Yasusi Hisaoka

Yasusi Hisaoka 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 removing foreign matters from a cathode-ray tube
    Patent number: 5403989
    Abstract: In a color cathode-ray tube, only a foreign matter adhering to a shadow mask is removed effectively without thermal deformation of the shadow mask or thermal denaturation of phosphors.An electron beam produced by an electron gun incorporated in a cathode-ray tube itself is scanned or irradiated to all over a shadow mask of the color cathode-ray tube. The radiant state of a fluorescent screen at this stage is checked to detect a foreign matter adhering to the shadow mask. The electron beam is deflected to align with the position at which the foreign matter is detected, and then irradiated to the foreign matter in the form of pulses. Thus, the foreign matter is heated and removed.
    Type: Grant
    Filed: March 24, 1993
    Date of Patent: April 4, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hiroaki Tobuse, Tomoyuki Kanda, Yasusi Hisaoka, Shigeo Sasaki, Minoru Kobayashi, Takuji Oda, Ryuji Ueda, Akio Yoshida, Tadayoshi Owaki, Akihiko Yamasaki, Masaaki Kinoshita, Toshiaki Fukunishi