Patents by Inventor Kuniyasu Kobayashi

Kuniyasu Kobayashi 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).

  • Impregnated cathode and method of manufacturing same, electron gun and electron tube
    Patent number: 6425793
    Abstract: An impregnated cathode and a method of manufacturing the same are provided for suppressing emission of unwanted electrons and particles generated from an excess electron emitting substance so as to achieve a steady electron emission characteristic. The impregnated cathode is placed directly beneath an electron emission hole of a first grid. The impregnated cathode is made up of a first sintered porous element whose surface functions as an electron emitting region and a second sintered porous element whose surface is a peripheral region other than the electron emitting region. The porosity of the first sintered porous element is greater than that of the second sintered porous element. Not only the first sintered porous element having the electron emitting region but also the second sintered porous element corresponding to the region around the electron emitting region is impregnated with the electron emitting substance.
    Type: Grant
    Filed: September 28, 2000
    Date of Patent: July 30, 2002
    Assignees: Sony Corporation, Citizen Watch Co., Ltd., Cimeo Precision Co., Ltd.
    Inventors: Yoji Hasegawa, Shinji Ogawa, Daichi Imabayashi, Makoto Furukawa, Nobuyuki Yoshino, Junji Sato, Yoshirou Hirai, Naoto Ogasawara, Kuniyasu Kobayashi
  • Impregnated cathode having varying surface porosity
    Patent number: 6252341
    Abstract: An impregnated cathode and a method of manufacturing the same are provided for suppressing emission of unwanted electrons and particles generated from an excess electron emitting substance so as to achieve a steady electron emission characteristic. The impregnated cathode is placed directly beneath an electron emission hole of a first grid. The impregnated cathode is made up of a first sintered porous element whose surface functions as an electron emitting region and a second sintered porous element whose surface is a peripheral region other than the electron emitting region. The porosity of the first sintered porous element is greater than that of the second sintered porous element. Not only the first sintered porous element having the electron emitting region but also the second sintered porous element corresponding to the region around the electron emitting region is impregnated with the electron emitting substance.
    Type: Grant
    Filed: November 2, 1998
    Date of Patent: June 26, 2001
    Assignees: Sony Corporation, Citizen Watch Co., Ltd, Cimeo Precision Co., Ltd.
    Inventors: Yoji Hasegawa, Shinji Ogawa, Daichi Imabayashi, Makoto Furukawa, Nobuyuki Yoshino, Junji Sato, Yoshirou Hirai, Naoto Ogasawara, Kuniyasu Kobayashi