Patents by Inventor Takuya Hamada

Takuya Hamada 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).

  • Phosphor material and its method of manufacture
    Patent number: 6673269
    Abstract: A phosphor material of the chemical composition formula (Sr1−x−y, Mgx, Cay)TiO3:Pr,Al, where the value of x+y is in the range 0.001 to 0.05. Another phosphor material has the chemical composition formula SrTiO3:Pr,Al, in which the surfaces of phosphor particles are diffused with a diffusing agent containing at least one of Be, Mg, Ca, Sr, and Ba. Still another phosphor material has the chemical composition formula SrTiO3:Pr,Al, where Sr/Ti molar ratio is 0.88 to 0.99.
    Type: Grant
    Filed: January 31, 2002
    Date of Patent: January 6, 2004
    Assignees: Nichia Corporation, Futaba Corporation
    Inventors: Tomokazu Suzuki, Takuya Hamada, Kazunori Kitagawa, Hitoshi Toki
  • Phosphor, method for preparing phosphor layer and vacuum fluorescent display
    Publication number: 20030057863
    Abstract: A phosphor without using cadmium having excellent luminous characteristic which emits a light in the visible region. The phosphor is prepared by mixing 1% of B2O3 powder and 10% of In2O3 with CaS:Eu, Ce phosphor to prepare a mixture to which is added vehicle containing an organic binder to form paste. The vacuum fluorescent display using the phosphor exhibits lifetime performance and initial luminance superior to the fluorescent display in which a phosphor without using B2O3 is applied.
    Type: Application
    Filed: August 28, 2002
    Publication date: March 27, 2003
    Inventors: Takuya Hamada, Kazunori Kitagawa, Hitoshi Toki
  • Phosphor material and its method of manufacture
    Publication number: 20020175314
    Abstract: The Phosphor material has the chemical composition formula (Sr1−x−y, Mgx, Cay)TiO3:Pr,Al; where the value of x+y is in the range 0.001 to 0.05.
    Type: Application
    Filed: January 31, 2002
    Publication date: November 28, 2002
    Inventors: Tomokazu Suzuki, Takuya Hamada, Kazunori Kitagawa, Hitoshi Toki
  • Phosphor and flourescent display device
    Publication number: 20020057229
    Abstract: A yellow light emission phosphor usable in a fluorescent display device does not include cadmium and Eu concentration in the yellow light emission phosphor is reduced to a range of about 0.001 mol % to about 0.1 mol %. The phosphor on a fluorescent display driven at a low voltage generates a yellow light emission with an excellent chromaticity and has a good life span characteristic.
    Type: Application
    Filed: September 18, 2001
    Publication date: May 16, 2002
    Applicant: Futaba Denshi Kogyo Kabushiki Kaisha
    Inventors: Takuya Hamada, Kazunori Kitagawa, Hitoshi Toki