Patents by Inventor Hiroko Konuma

Hiroko Konuma 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).

  • Patent number: 5827448
    Abstract: A ferroelectric liquid crystal device is described. The device comprises a pair of substrates, an electrode arrangement formed on the inside surface of the substrates, an orientation control surface provided on the inside surface of one of said substrates, and a blended ferroelectric liquid crystal disposed between the substrates. By suitably preparing the liquid crystal, multi-micro-domains are formed in the liquid crystal. By virtue of the multi-micro-domains, the contrast ratio and the response speed are significantly improved.
    Type: Grant
    Filed: November 13, 1991
    Date of Patent: October 27, 1998
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Toshimitsu Konuma, Akira Mase, Shunpei Yamazaki, Misao Yagi, Hitoshi Kondo, Mika Tadokoro, Hiroko Konuma, Hiroshi Sugiyama, Toshimitsu Hagiwara
  • Patent number: 5454976
    Abstract: A ferroelectric liquid crystal composition exhibiting a chiral smectic C phase, in which the tilt angle with an electric field applied is from 12.degree. to 18.degree. and the tilt angle during memory is from 8.degree. to 15.degree., and a liquid crystal display device are disclosed. The composition has high memory effects, high display contrast, and high rate of reponse.
    Type: Grant
    Filed: May 4, 1994
    Date of Patent: October 3, 1995
    Assignee: Takasago International Corporation
    Inventors: Misao Yagi, Hitoshi Kondo, Mika Tadokoro, Hiroko Konuma, Hiroshi Sugiyama, Toshimitsu Hagiwara
  • Patent number: 5275756
    Abstract: A fluorine-containing optically active compound represented by formula (I): ##STR1## wherein R.sub.1 represents a straight chain alkyl or alkoxy group having from 6 to 14 carbon atoms or a 4-alkylphenyl or 4-alkoxyphenyl group having from 8 to 12 carbon atoms; R.sub.2 represents a straight chain alkyl group having from 1 to 8 carbon atoms; C.sup.* represents an asymmetric carbon atoms; and X represents a hydrogen atom or a fluorine atom, provided that X represents a fluorine atom when R.sub.1 contains a phenyl group, and a liquid crystal composition containing the same are disclosed. The compound (I) has large spontaneous polarization and low viscosity to achieve a fast response time. In the N.sup.* phase of the compound (I), the helical pitch has small temperature dependence.
    Type: Grant
    Filed: July 31, 1991
    Date of Patent: January 4, 1994
    Assignee: Takasago International Corporation
    Inventors: Akio Yamaguchi, Shigeru Mitsuhashi, Mamoru Yamada, Minzo Sakaguchi, Hiroshi Sugiyama, Hiroko Konuma, Hitoshi Kondo, Toshimitsu Hagiwara