Patents by Inventor Chie Nagao

Chie Nagao 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).

  • Projection cathode-ray tube with interference film
    Patent number: 5166577
    Abstract: A projection cathode-ray tube includes a multilayered interference film interposed between a face plate and a cathode-ray tube. In order to improve brightness in a direction of the normal, then on a face plate, a phosphor layer is composed of a first layer substantially consisting of large size phosphor particles and a second layer substantially consisting of small size phosphor particles. In addition, a phosphor density of the phosphor layer is set from 20 to 50% larger than that necessary to produce a maximum brightness on a cathode-ray tube without the multilayered interference film. The phosphor particles of the phosphor layer are preferably material having a high reflectance.
    Type: Grant
    Filed: May 23, 1991
    Date of Patent: November 24, 1992
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Chie Nagao, Noritsuna Hashimoto, Hiroshi Okuda, Yasuo Iwasaki