Patents by Inventor Shuzo Watanabe

Shuzo Watanabe 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).

  • Thermionic cathode
    Patent number: 4137476
    Abstract: A thermionic cathode for an electron beam device is provided which comprises a first layer of thermoelectron emissive compound sharpened towards a point, a third layer of metal of high melting point and a second layer of reaction barrier interposed between the first and third layers, current terminals being attached to said third layer. According to the invention, a thermionic cathode capable of emitting stable electron beams of high intensity for a long period of time can be manufactured.
    Type: Grant
    Filed: May 18, 1977
    Date of Patent: January 30, 1979
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Masaji Ishii, Shuzo Watanabe, Akira Miyai, Hideo Hiraoka