Patents Assigned to World Munsell Co., Ltd.
  • 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