Patents by Inventor Kazuhiko Tsujibata

Kazuhiko Tsujibata 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).

  • Plastic base material
    Patent number: 6770692
    Abstract: The present invention provides, by adding an ultraviolet absorbent and a colorant having a specific chemical structure, a plastic base material capable of effectively suppressing the transmission of ultraviolet radiation and short wavelength visible radiation known harmful to eyes, which material further reduces glares.
    Type: Grant
    Filed: June 11, 2002
    Date of Patent: August 3, 2004
    Assignee: Asahi Lite Optical Co., Ltd.
    Inventors: Tadashi Kobayashi, Kazuhiko Tsujibata