Patents by Inventor Kyouta Ueda

Kyouta Ueda 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).

  • Oxynitride phosphor activated by a rare earth element, and sialon type phosphor
    Patent number: 6776927
    Abstract: An oxynitride phosphor activated by a rare earth element, represented by the formula CaxSi12−(m+n)Al(m+n)OnN16−n: EuyDyz, wherein stabilizing metal (Ca) is substituted partially by Eu or Eu and Dy where 0.3<x<1.5, 0.01<y<0.7, 0≦z<0.1, 0.6<m<3.0 and 0<n<1.5.
    Type: Grant
    Filed: April 8, 2003
    Date of Patent: August 17, 2004
    Assignee: National Institute for Materials Science
    Inventors: Mamoru Mitomo, Tadashi Endo, Kyouta Ueda, Masakazu Komatsu
  • Oxynitride phosphor activated by a rare earth element, and sialon type phosphor
    Patent number: 6632379
    Abstract: A sialon type phosphor in the form of a powder comprising at least 40 wt % of &agr;-sialon represented by the formula (Cax,My)(Si,Al)12(O,N)16 (where M is at least one metal selected from the group consisting of Eu, Tb, Yb and Er, 0.05<(x+y)<0.3, 0.02<x<0.27 and 0.03<y<0.3) and having a structure such that Ca sites of Ca-&agr;-sialon are partially substituted by other metal M, at most 40 wt % of &bgr;-sialon, and at most 30 wt % of unreacted silicon nitride.
    Type: Grant
    Filed: June 6, 2002
    Date of Patent: October 14, 2003
    Assignee: National Institute for Materials Science
    Inventors: Mamoru Mitomo, Tadashi Endo, Kyouta Ueda, Masakazu Komatsu
  • Oxynitride phosphor activated by a rare earth element, and sialon type phosphor
    Publication number: 20030168643
    Abstract: An oxynitride phosphor activated by a rare earth element, represented by the formula MexSi12−(m+n)Al(m+n)OnN16−n:Re1yRe2x, wherein a part or all of metal Me (where Me is at least one metal selected from the group consisting of Ca, Mg, Y and lanthanide metals excluding La and Ce) in &agr;-sialon solid solution, is substituted by lanthanide metal Re1 (where Re1 is at least one metal selected from the group consisting of Ce, Pr, Eu, Tb, Yb and Er), or two lanthanide metals Re1 and a coactivator Re2 (where Re2 is Dy), to be an emission center.
    Type: Application
    Filed: April 8, 2003
    Publication date: September 11, 2003
    Applicant: National Institute for Materials Science
    Inventors: Mamoru Mitomo, Tadashi Endo, Kyouta Ueda, Masakazu Komatsu
  • Oxynitride phosphor activated by a rare earth element, and sialon type phosphor
    Publication number: 20030030038
    Abstract: An oxynitride phosphor activated by a rare earth element, represented by the formula MexSi12−(m+n)Al(m+n)OnN16−n:Re1yRe2x, wherein a part or all of metal Me (where Me is at least one metal selected from the group consisting of Ca, Mg, Y and lanthanide metals excluding La and Ce) in &agr;-sialon solid solution, is substituted by lanthanide metal Re1 (where Re1 is at least one metal selected from the group consisting of Ce, Pr, Eu, Tb, Yb and Er), or two lanthanide metals Re1 and a coactivator Re2 (where Re2 is Dy), to be an emission center.
    Type: Application
    Filed: June 6, 2002
    Publication date: February 13, 2003
    Applicant: National Institute for Materials Science
    Inventors: Mamoru Mitomo, Tadashi Endo, Kyouta Ueda, Masakazu Komatsu