Patents by Inventor Katsumi Yaha

Katsumi Yaha 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 of manufacturing a cathode ray tube and apparatus manufacturing the same
    Patent number: 6406742
    Abstract: A coating apparatus for forming a high-resistance film on the inner surface of the neck of the funnel of a cathode ray tube has a nozzle that can be inserted into the neck. The nozzle, which is provided for applying a material liquid to the inner surface of the neck, has a jet hole inclined toward the direction of gravity. The material liquid applied through the jet hole thus inclined scarcely flows upwardly on the inner surface of the neck. The liquid therefore forms a high-resistance film having a uniform thickness on the inner surface of the neck of the funnel. Having a uniform thickness, the high-resistance film inhibits the charge-up of the neck potential, reducing the convergence drift caused by the charge-up of the neck potential.
    Type: Grant
    Filed: November 10, 1998
    Date of Patent: June 18, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takahiro Hasegawa, Shigeru Sugawara, Fumihito Suzuki, Fumio Miyanaga, Katsumi Yaha