Patents by Inventor Tohru Yamanaka

Tohru Yamanaka 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).

  • Liquid crystal compositions
    Patent number: 6007737
    Abstract: The first smectic liquid crystal composition of the invention has a voltage gradation parameter L of less than 0.6, said parameter being defined by the equation L=S.sub.H /S.sub.O with the proviso that: a liquid crystal cell filled with a liquid crystal composition is placed between a pair of polarizing plates arranged in the crossed Nicols state; a voltage is applied to the liquid crystal cell to form a hysteresis curve showing a correlation between the voltage and a transmittance; and a tangent line I.sub.R of the hysteresis curve within a region wherein the transmittance steeply increases intersects a tangent line I.sub.F of the hysteresis curve within a region which is adjacent to the voltage-steep increase region and which is on the higher-voltage side at an intersection point P. In the above equation, S.sub.
    Type: Grant
    Filed: November 25, 1997
    Date of Patent: December 28, 1999
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Shinichi Nishiyama, Yuichirou Tatsuki, Takahiro Fujiyama, Chiho Hirano, Hideo Hama, Tohru Yamanaka