Patents by Inventor Noritsuna Hashimoto

Noritsuna Hashimoto 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).

  • Material for converting ultraviolet ray and display device using the same
    Patent number: 6583561
    Abstract: The object of the present invention is to provide a gas discharge display device having improved luminous efficiency by effectively using ultraviolet ray, which is absorbed in a partition wall or a protective film and the like without contributing to excitation of a fluorescent material. By adding gadolinium to the materials excluding the fluorescent material among structures surrounding the discharge cell, ultraviolet ray having a wavelength of 315 nm is generated, which can excite the fluorescent material. The ultraviolet ray excites the fluorescent material to generate visible light, and then, electric-light conversion efficiency is improved.
    Type: Grant
    Filed: February 14, 2001
    Date of Patent: June 24, 2003
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takao Sawada, Keiji Fukuyama, Noritsuna Hashimoto, Ko Sano, Manabu Akiba
  • Material for converting ultraviolet ray and display device using the same
    Publication number: 20010050528
    Abstract: The object of the present invention is to provide a gas discharge display device having improved luminous efficiency by effectively using ultraviolet ray, which is absorbed in a partition wall or a protective film and the like without contributing to excitation of a fluorescent material. By adding gadolinium to the materials excluding the fluorescent material among structures surrounding the discharge cell, ultraviolet ray having a wavelength of 315 nm is generated, which can excite the fluorescent material. The ultraviolet ray excites the fluorescent material to generate visisble light, and then, electric-light conversion efficiency is improved.
    Type: Application
    Filed: February 14, 2001
    Publication date: December 13, 2001
    Inventors: Takao Sawada, Keiji Fukuyama, Noritsuna Hashimoto, Ko Sano, Manabu Akiba
  • 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
  • Phosphor
    Patent number: 4764301
    Abstract: A phosphor excellent in its temperature-versus-luminance characteristics, which is represented by the following formula:(La.sub.1-x-y Ce.sub.x Tb.sub.y) mBO.sub.3.nPO.sub.4(where: 0.15.ltoreq.x.ltoreq.0.45; 0.1.ltoreq.y.ltoreq.0.2; and 0.01.ltoreq.m/(m+n).ltoreq.0.045).
    Type: Grant
    Filed: February 25, 1987
    Date of Patent: August 16, 1988
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kenzo Awazu, deceased, Kazu Matsunaga, Noritsuna Hashimoto