Patents by Inventor Tomofumi Moriyama

Tomofumi Moriyama 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 with afterglow characteristic
    Patent number: 5770111
    Abstract: A phosphor exhibiting afterglow more intensely and persistently than (Sr, Eu, Dy)O.Al.sub.2 O.sub.3 phosphors. The phoshor has a chemical composition comprising mainly an Eu.sup.2+ activated strontium aluminate phosphor substance as a matrix in which a part of the strontium (Sr) is substituted with at least one of Pb, Dy and Zn.
    Type: Grant
    Filed: November 26, 1996
    Date of Patent: June 23, 1998
    Assignee: Kabushiki Kaisha Tokyo Kagaku Kenkyusho
    Inventors: Hirofumi Moriyama, Tomofumi Moriyama, Teruo Goto