Patents by Inventor Kouichi Sassa

Kouichi Sassa 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).

  • Silicon-and-nitrogen-containing luminescent substance, method for forming the same, and light emitting device using the same
    Patent number: 6399225
    Abstract: A luminescent substance contains silicon and nitrogen as major components and has an amorphous structure. The silicon content of the luminescent substance is greater than the stoichiometric silicon content of Si3N4, and the luminous intensity of the luminescent substance has a maximum at approximately 2.2 eV. The luminescent substance has a high luminous efficiency and a short luminous decay lifetime. A light-emitting device includes this luminescent substance and a substrate. The luminescent substance can be readily formed on the substrate by a chemical vapor deposition process.
    Type: Grant
    Filed: March 6, 2000
    Date of Patent: June 4, 2002
    Assignee: Mitsubishi Materials Corporation
    Inventors: Kenji Yamaguchi, Kazuki Mizushima, Kouichi Sassa