Patents by Inventor Yuka Sudo

Yuka Sudo 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).

  • Optically active compounds, liquid crystal compositions comprising said compounds, and liquid crystal optical modulators using said compositions
    Patent number: 5370821
    Abstract: The invention relates to optically active compounds represented by the general formula ##STR1## wherein R.sub.1, R.sub.2, Q.sub.1, Q.sub.2, Q.sub.3, ##STR2## and M are defined as in the specification, methods and intermediates for their preparation, liquid crystal compositions comprising at least one optically active compound of formula I and their use in electrooptical display, switching and modulation devices.
    Type: Grant
    Filed: January 11, 1993
    Date of Patent: December 6, 1994
    Assignees: Takeda Chemical Industries, Ltd., Hitachi, Ltd.
    Inventors: Koichi Matsumura, Mitsuru Kawada, Yoshitaka Uesugi, Yuka Sudo, Katsumi Kondo, Teruo Kitamura
  • Optically active compounds, liquid crystal composition containing said compounds, and liquid crystal optical modulator using said composition
    Patent number: 5328643
    Abstract: The invention relates to optically active compounds represented by the general formula I ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, Q.sub.1, Q.sub.2, Q.sub.3, and M are defined as in the specification, methods and intermediates for their preparation, liquid crystal compositions comprising at least one optically active compound of formula I and their use in electrooptical display, switching and modulation devices.
    Type: Grant
    Filed: February 26, 1992
    Date of Patent: July 12, 1994
    Assignees: Takeda Chemical Industries, Ltd., Hitachi, Ltd.
    Inventors: Yuka Sudo, Katsumi Kondo, Teruo Kitamura, Koichi Matsumura, Mitsuru Kawada, Yoshihiro Sugihara
  • Optically active compounds, liquid crystal compositions comprising said compounds and liquid crystal optical modulators using said compositions
    Patent number: 5269965
    Abstract: The invention relates to optically active compounds represented by the general formula ##STR1## wherein R.sub.1, R.sub.2, Q.sub.1, Q.sub.2, Q.sub.3, ##STR2## and M are defined as in the specification, methods and intermediates for their preparation, liquid crystal compositions comprising at least one optically active compound of formula I and their use in electrooptical display, switching and modulation devices.
    Type: Grant
    Filed: April 15, 1993
    Date of Patent: December 14, 1993
    Assignees: Takeda Chemical Industries, Hitachi, Ltd.
    Inventors: Koichi Matsumura, Mitsuru Kawada, Yoshitaka Uesugi, Yuka Sudo, Katsumi Kondo, Teruo Kitamura
  • Optically active compounds, liquid crystal compositions comprising said compounds, and liquid crystal optical modulators using said compositions
    Patent number: 5152919
    Abstract: The present invention discloses dichiral compounds represented by the general formula ##STR1## (R.sub.1, R.sub.2, R.sub.3, R.sub.4, Q.sub.1, Q.sub.2, Q.sub.3, M and n have the same definitions as in the description portion of the specification), intermediates for preparation of said compounds, liquid crystal compositions comprising said compounds, and liquid crystal optical modulators using said compositions.
    Type: Grant
    Filed: March 22, 1990
    Date of Patent: October 6, 1992
    Assignees: Hitachi, Ltd., Takeda Chemical Industries, Ltd.
    Inventors: Teruo Kitamura, Katsumi Kondo, Yuka Sudo, Koichi Matsumura, Mitsuru Kawada, Yoshihiro Sugihara