Patents by Inventor Hideo Koshino

Hideo Koshino 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).

  • Indirectly heated cathode for a CRT having high purity alumina insulating layer with limited amounts of Na OR Si
    Patent number: 6242854
    Abstract: In an indirectly heated cathode comprising a heater having an alumina electrical insulating layer formed by layering and sintering alumina particles on a surface of a metal wire and an electron-emitting part that receives heat from the heater and emits thermoelectrons, and a cathode-ray tube comprising the indirectly heated cathode, the alumina particles contained in the alumina electrical insulating layer have a purity of at least 99.7 wt % and the alumina particles used for forming the alumina electrical insulating layer have a Na content of 20 ppm or less or a Si content of 100 ppm or less, thus enabling stable production, avoiding the occurrence of cracks in the alumina electrical insulating layer and heater deformation even in the practical operation of the cathode-ray tube, and lengthening the life of the heater.
    Type: Grant
    Filed: January 11, 1999
    Date of Patent: June 5, 2001
    Assignee: Matsushita Electronics Corporation
    Inventors: Yoji Yamamoto, Masaki Kawasaki, Hideo Koshino, Junya Nakai, Tetsuya Shimizu