Patents by Inventor Fumitaka Iwakura

Fumitaka Iwakura 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 for dispersion-type EL, dispersion-type EL device, and method of manufacturing the same
    Patent number: 9305736
    Abstract: Provided is a phosphor for a dispersion-type EL that may be manufactured in a simple process and may provide stable, high brightness and light emission efficiency. The phosphor for a dispersion-type EL according to the present invention includes a mixture of an electron-accepting phosphor particle (4A) and an electron-donating phosphor particle (4B). The electron-accepting phosphor particle (4A) includes a base particle and an acceptor element added thereto, and the electron-donating phosphor particle (4B) includes a base particle and a donor element added thereto. For example, the base particle is a ZnS particle, the acceptor element is Cu, and the donor element is Cl or Al.
    Type: Grant
    Filed: July 11, 2012
    Date of Patent: April 5, 2016
    Assignee: TAZMO CO., LTD.
    Inventors: Koichi Wani, Tatsuya Kanda, Emi Hashimoto, Kazushi Kawakami, Sadahiro Yagishita, Fumitaka Iwakura, Taku Nishikawa
  • PHOSPHOR FOR DISPERSION-TYPE EL, DISPERSION-TYPE EL DEVICE, AND METHOD OF MANUFACTURING THE SAME
    Publication number: 20140138590
    Abstract: Provided is a phosphor for a dispersion-type EL that may be manufactured in a simple process and may provide stable, high brightness and light emission efficiency. The phosphor for a dispersion-type EL according to the present invention includes a mixture of an electron-accepting phosphor particle (4A) and an electron-donating phosphor particle (4B). The electron-accepting phosphor particle (4A) includes a base particle and an acceptor element added thereto, and the electron-donating phosphor particle (4B) includes a base particle and a donor element added thereto. For example, the base particle is a ZnS particle, the acceptor element is Cu, and the donor element is Cl or Al.
    Type: Application
    Filed: July 11, 2012
    Publication date: May 22, 2014
    Applicant: TAZMO CO., LTD.
    Inventors: Koichi Wani, Tatsuya Kanda, Emi Hashimoto, Kazushi Kawakami, Sadahiro Yagishita, Fumitaka Iwakura, Taku Nishikawa