Patents by Inventor Takao Ouchi

Takao Ouchi 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