Patents by Inventor Toshiya Otsuki

Toshiya Otsuki 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).

  • Eyeglass lenses for correcting color vision
    Patent number: 6135595
    Abstract: An inexpensive, high-performance, color vision correcting plastic eyeglass lens comprises a partial reflection film for partially reflecting light, or a coloring agent for partially absorbing light, or a combination thereof, so that an intended color vision rectifying spectral characteristic curve can be established in or imparted to the lens.
    Type: Grant
    Filed: February 22, 1999
    Date of Patent: October 24, 2000
    Assignees: Seiko Epson Corporation, World Munsell Co., Ltd.
    Inventors: Katsuyoshi Takeshita, Kunihiko Yano, Yoshihiko Kasai, Toshiya Otsuki