Patents by Inventor Kasumi Ikegami

Kasumi Ikegami 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).

  • Phase transition-type liquid crystal composition
    Patent number: 5422033
    Abstract: A phase transition-type liquid crystal composition including a mixture of ester-type liquid crystal compound and chiral nematic liquid crystal compound having added thereto at least one of ethane-type liquid crystal compound and bicyclohexane-type liquid crystal compound. The liquid crystal composition exhibits an extended width (.DELTA.V) of voltage hysteresis and therefore a stabilized homeotropic (H') state, when its voltage hysteresis curve is plotted. The liquid crystal display devices or elements using this composition have a fast response characteristic and enable a large scale or area display and an input operation using keyboards.
    Type: Grant
    Filed: November 22, 1993
    Date of Patent: June 6, 1995
    Assignee: Fujitsu Limited
    Inventors: Akihiro Mochizuki, Watanuki Tsuneo, Kazumasa Saito, Kasumi Ikegami
  • Projection type liquid crystal display device
    Patent number: 4812034
    Abstract: A cholesteric-nematic phase transition type liquid crystal with positive dielectric anisotropy is used in a projection type liquid crystal display device. This allows a bright and high information contents display with a compact, light, and low cost device and allows machinery input and thus simultaneous display at remote places, such as remote conference rooms or remote notice boards, in bright locations.
    Type: Grant
    Filed: December 21, 1987
    Date of Patent: March 14, 1989
    Assignee: Fujitsu Limited
    Inventors: Akihiro Mochizuki, Masayuki Iwasaki, Yasuo Yamagishi, Kasumi Ikegami, Hiroyuki Gondo, Hisashi Yamaguchi
  • Storage-type liquid crystal composition
    Patent number: 4547309
    Abstract: A storage type liquid crystal composition in which a nematic-cholesteric mesophase transition is utilized and the anisotropy of the dielectric constant is positive and an X-Y dot-matrix-type storage-type liquid-crystal display element comprising the composition. The present liquid crystal composition has low driving voltage and long memory effect. This composition comprises a cyclohexane-type liquid crystal, an azoxy-type liquid crystal, and a compensated cholesteric liquid crystal and/or cholesteryl oleate.
    Type: Grant
    Filed: December 6, 1983
    Date of Patent: October 15, 1985
    Assignee: Fujitsu Limited
    Inventors: Akihiro Mochizuki, Kasumi Ikegami, Toshiaki Narusawa, Hirofumi Okuyama
  • Holographic recording material and process for producing holograms
    Patent number: 4517266
    Abstract: A holographic recording material comprising a polymer containing vinylcarbazole rings, a cyclic cis-.alpha.-dicarbonyl compound capable of forming a radical by light irradiation and a dye as a photosensitizer or a spectral sensitizer. A hologram can be obtained by exposing the holographic recording material to an interference pattern of a radiation to form a holographic interference pattern, subjecting the material to a swelling treatment in a first medium, and then subjecting the material to a contraction treatment in a second medium.
    Type: Grant
    Filed: January 18, 1983
    Date of Patent: May 14, 1985
    Assignee: Fujitsu Limited
    Inventors: Kasumi Ikegami, Hirofumi Okuyama