Patents by Inventor Igarashi Takahiro

Igarashi Takahiro 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).

  • Method for producing light-emitting substance
    Patent number: 6447698
    Abstract: A manufacturing method for a nanocrystal light emission substance having a nano structure crystal, doped with an activator and cured with ultraviolet light. The nanocrystal light emission substance is synthesized by a liquid phase co-precipitation process. During the liquid phase reaction, an organic acid, such as acrylic acid or methacrylic acid, is added. Alternatively, a high molecular organic acid, such as polyacrylic or polymethacrylic acid, polystyrene, is added after the liquid phase reaction. The resulting substance is then cured with ultraviolet light.
    Type: Grant
    Filed: September 17, 1999
    Date of Patent: September 10, 2002
    Assignee: Sony Corporation
    Inventors: Masaru Ihara, Igarashi Takahiro, Tsuneo Kusunoki, Katsutoshi Ohno, Mamoru Senna, Tetsuhiko Isobe, Miho Konishi