Patents by Inventor Daizi Hirosawa

Daizi Hirosawa 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).

  • Shadow mask manufacturing method, shadow mask manufacturing apparatus, and cleaning device used in the method and apparatus
    Patent number: 6193897
    Abstract: A shadow mask manufacturing method comprising the cleaning step performs rapid cleaning by spraying a cleaning solution, which is inert with respect to the band-like thin metal plate, upon upper and lower surfaces of the band-like thin metal plate and thereby generating cavitation near the surfaces of the band-like thin metal plate by using cavitation jet means, while regulating a position of the band-like thin metal plate and preventing the cleaning solution from leaking in a direction opposite to the conveyance direction of the band-like thin metal plate by using a first leakage-preventing seal unit provided upstream the cavitation jet means.
    Type: Grant
    Filed: July 2, 1997
    Date of Patent: February 27, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masaru Nikaido, Sachiko Hirahara, Yukio Okudo, Daizi Hirosawa, Hiroharu Takezawa