Patents by Inventor Susumu Omatoi

Susumu Omatoi 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).

  • Long persistent phosphorescence phosphor
    Patent number: 5839718
    Abstract: A long persistent phosphorescence phosphor contains a europium-activated long persistent phosphorescence silicate phosphor of the formula (I),m(Sr.sub.1-a M.sup.1.sub.a)O.multidot.n(Mg.sub.1-b M.sup.2.sub.b)O.multidot.2(Si.sub.1-c Ge.sub.c)O.sub.2 :Eu.sub.x Ln.sub.y (I)containing at least one halogen atom in a specific amount, and an organic fluorescent pigment which is deposited on the surface of the europium-activated long persistent silicate phosphor.
    Type: Grant
    Filed: July 22, 1997
    Date of Patent: November 24, 1998
    Assignees: USR Optonix Inc., Kasei Optonix, Ltd.
    Inventors: Takashi Hase, Susumu Omatoi, Takao Ouchi
  • Phosphor and cathode-ray tube using the same
    Patent number: 5363013
    Abstract: Disclosed are terbium-activated oxide phosphors having incorporated, at least one of ytterbium, thulium, samarium and europium. Incorporation of the element (s) has made it possible to produce phosphors exhibiting high brightness and suffering little brightness deterioration under high-density electron bombardment.
    Type: Grant
    Filed: October 6, 1992
    Date of Patent: November 8, 1994
    Assignees: Hitachi Ltd., Kasei Optonix Ltd.
    Inventors: Hidetsugu Matsukiyo, Teruki Suzuki, Hajime Yamamoto, Yasuhiko Uehara, Yasukazu Morita, Yoshihiro Koseki, Hiromichi Yamada, Shigeo Fujino, Takashi Hase, Tsutomu Yamada, Susumu Omatoi
  • Phosphor and cathode-ray tube using the same
    Patent number: 5177401
    Abstract: Disclosed are terbium-activated oxide phosphors having incorporated, at least one of ytterbium, thulium, samarium and europium. Incorporation of the element (s) has made it possible to produce phosphors exhibiting high brightness and suffering little brightness deterioration under high-density electron bombardment.
    Type: Grant
    Filed: December 4, 1989
    Date of Patent: January 5, 1993
    Assignees: Hitachi, Ltd., Kasei Optonix Ltd.
    Inventors: Hidetsugu Matsukiyo, Teruki Suzuki, Hajime Yamamoto, Yasuhiko Uehara, Yasukazu Morita, Yoshihiro Koseki, Hiromichi Yamada, Shigeo Fujino, Takashi Hase, Tsutomu Yamada, Susumu Omatoi
  • Electron-beam existed display tube, the screen of which has a fluorescent component of a Eu containing red fluorescent component and a blue or green fluorescent component
    Patent number: 4814666
    Abstract: The present invention relates to an electron-beam excited display tube useful in such a display apparatus as a color cathode-ray tube. In accordance with the present invention, the content of europium as a activator for a rare earth oxysulfide fluorescent material used as the red emission component is within the range of 0.05 to 2.0 mol %, thereby providing a very bright and low cost electron-beam excited display tube without any uneven color reproduction, even when the display screen is seen from very close quarters.
    Type: Grant
    Filed: March 9, 1987
    Date of Patent: March 21, 1989
    Assignee: Kasei Optonix, Ltd.
    Inventors: Kazuhito Iwasaki, Hideo Tono, Susumu Omatoi
  • Phosphor
    Patent number: 4544605
    Abstract: A phosphor having formed on its surface generally spherical or semi-spherical surface treating substance composed of silicon dioxide, an aluminum compound and a zinc compound, at least 70% by weight of the surface treating substance being in the form of particles having an average particle size within a range of from 60 to 300 m.mu.m.
    Type: Grant
    Filed: August 23, 1983
    Date of Patent: October 1, 1985
    Assignee: Kasei Optonix, Ltd.
    Inventors: Tomohiro Miyazaki, Hitoshi Tanaka, Goro Matsumoto, Noboru Matsuhisa, Susumu Omatoi