Patents by Inventor Tetsuo Okugawa

Tetsuo Okugawa 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).

  • Method of using liquid crystal device comprising dichroic dye and liquid crystal device
    Patent number: 4668050
    Abstract: A dichroic dye for use in a liquid crystal comprising at least one compound represented by a formula: ##STR1## The compound includes monoazo, disazo and trisazo compounds. The dye has a high dichroic ratio, a high mole absorptivity and a good compatibility with liquid crystals.
    Type: Grant
    Filed: October 10, 1985
    Date of Patent: May 26, 1987
    Assignees: Casio Computer Co., Ltd., Showa Chemical Co., Ltd.
    Inventors: Hisashi Aoki, Kaoru Kodera, Tetsuo Okugawa