Patents by Inventor Yasuo Umezu

Yasuo Umezu 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).

  • Double-layer liquid crystal device having a three dimensional network structure
    Patent number: 5296952
    Abstract: A light scattering liquid crystal device having a double structure composed of (1) a first display panel of light scattering type which comprises a pair of transparent substrates each having a transparent electrode layer and a light controlling layer formed therebetween, said light controlling layer containing a liquid crystal material and a transparent solid substance and (2) a second display panel comprising a pair of transparent substrates each having an electrode layer and a liquid crystal material filled therebetween, selected from a guest-host type liquid crystal display panel containing a dichroic dye and a twisted or super-twisted nematic liquid crystal display panel having a pair of polarizers. The device achieves brightness and high contrast.
    Type: Grant
    Filed: August 2, 1993
    Date of Patent: March 22, 1994
    Assignee: Dainippon Ink & Chemicals Inc.
    Inventors: Haruyoshi Takatsu, Kiyofumi Takeuchi, Yasuo Umezu