Patents by Inventor Seiko Hirayama

Seiko Hirayama 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 and method for producing same
    Patent number: 8580148
    Abstract: It is an object of the present invention to provide an alkaline earth metal aluminate phosphor having good heat resistance and durability against vacuum ultraviolet rays and ultraviolet rays, among others, and a method of producing the same. An alkaline earth metal aluminate phosphor containing bivalent europium as an activator, which contains at least one element (e) selected from the group consisting of indium, tungsten, niobium, bismuth, molybdenum, tantalum, thallium and lead.
    Type: Grant
    Filed: March 12, 2004
    Date of Patent: November 12, 2013
    Assignee: Sakai Chemical Industry Co., Ltd.
    Inventors: Seiko Hirayama, Keita Kobayashi, Junya Ishii, Mizuho Wada, Shinji Nakahara
  • Phosphor and method for producing same
    Publication number: 20060091360
    Abstract: It is an object of the present invention to provide an alkaline earth metal aluminate phosphor having good heat resistance and durability against vacuum ultraviolet rays and ultraviolet rays, among others, and a method of producing the same. An alkaline earth metal aluminate phosphor containing bivalent europium as an activator, which contains at least one element (e) selected from the group consisting of indium, tungsten, niobium, bismuth, molybdenum, tantalum, thallium and lead.
    Type: Application
    Filed: March 12, 2004
    Publication date: May 4, 2006
    Inventors: Seiko Hirayama, Keita Kobayashi, Junya Ishii