Patents by Inventor Seiji Niki

Seiji Niki 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).

  • Green emitting yttrium silicate phosphor and cathode-ray tube using the same
    Patent number: 7161287
    Abstract: The present invention provides a green emitting yttrium silicate phosphor, which has an improved temperature characteristic and life, and a cathode-ray tube using it. A green emitting yttrium silicate phosphor according to the present invention comprises a composition having the general composition (Y, Sc, Tb)2SiO5, wherein the mole ratio of Sc to the entire rare-earth element in the phosphor is 0.045<Sc/(Y+Sc+Tb)<0.17. Adding the above concentration range of Sc improves its temperature characteristic and life. It is more preferable that the concentration range is 0.07<Sc/(Y+Sc+Tb)<0.13.
    Type: Grant
    Filed: November 10, 2004
    Date of Patent: January 9, 2007
    Assignees: Nichia Corporation, Matsushita Toshiba Picture Display Co., Ltd.
    Inventors: Yasunobu Noguchi, Seiji Niki, Kanji Tanaka, Shunji Fukushima
  • Green emitting yttrium silicate phosphor and cathode-ray tube using the same
    Publication number: 20060033418
    Abstract: The present invention provides a green emitting yttrium silicate phosphor, which has an improved temperature characteristic and life, and a cathode-ray tube using it. A green emitting yttrium silicate phosphor according to the present invention comprises a composition having the general composition (Y, Sc, Tb)2SiO5, wherein the mole ratio of Sc to the entire rare-earth element in the phosphor is 0.045<Sc/(Y+Sc+Tb)<0.17. Adding the above concentration range of Sc improves its temperature characteristic and life. It is more preferable that the concentration range is 0.07<Sc/(Y+Sc+Tb)<0.13.
    Type: Application
    Filed: November 10, 2004
    Publication date: February 16, 2006
    Inventors: Yasunobu Noguchi, Seiji Niki, Kanji Tanaka, Shunji Fukushima