Patents by Inventor Satoko Tezuka

Satoko Tezuka 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).

  • Alkaline earth metal silicate phosphor and method for producing same
    Patent number: 9938459
    Abstract: An object of the present invention is to provide: an alkaline earth metal silicate phosphor to which Eu is added as an activator, and which has an emission peak wavelength of 600 nm or more, high luminance and excellent color rendering properties; and a method for producing the alkaline earth metal silicate phosphor. An alkaline earth metal silicate phosphor of the present invention is represented by composition formula (1) and having an emission peak wavelength of 600 nm or more and a circularity of 85% or more. Composition formula (1): (SraCabBacEud)2SieOf (in the formula, a, b, c, d, e and f satisfy 0.4<a<0.6, 0.4<b<0.6, 0.01<c<0.05, 0.01?d<0.4,0.7?e?1.3, 3.0?f?5.0 and a+b+c+d=1).
    Type: Grant
    Filed: June 17, 2013
    Date of Patent: April 10, 2018
    Assignees: SUMITOMO METAL MINING CO., LTD, TOHOKU UNIVERSITY
    Inventors: Tetsufumi Komukai, Jun Yokoyama, Masato Kakihana, Satoko Tezuka, Hideki Kato
  • ALKALINE EARTH METAL SILICATE PHOSPHOR AND METHOD FOR PRODUCING SAME
    Publication number: 20150203749
    Abstract: An object of the present invention is to provide: an alkaline earth metal silicate phosphor to which Eu is added as an activator, and which has an emission peak wavelength of 600 nm or more, high luminance and excellent color rendering properties; and a method for producing the alkaline earth metal silicate phosphor. An alkaline earth metal silicate phosphor of the present invention is represented by composition formula (1) and having an emission peak wavelength of 600 nm or more and a circularity of 85% or more. Composition formula (1): (SraCabBacEud)2SieOf (in the formula, a, b, c, d, e and f satisfy 0.4<a<0.6, 0.4<b<0.6, 0.01<c<0.05, 0.01?d<0.4, 0.7?e?1.3, 3.0?f?5.0 and a+b+c+d=1).
    Type: Application
    Filed: June 17, 2013
    Publication date: July 23, 2015
    Inventors: Tetsufumi Komukai, Jun Yokoyama, Masato Kakihana, Satoko Tezuka, Hideki Kato