Patents by Inventor Yuzi Kato

Yuzi Kato 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 compounds and compositions
    Patent number: 4921632
    Abstract: Liquid Crystal compounds represented by the following formula are disclosed. ##STR1## wherein R and R' are independently selected from alkyl groups containing 1.about.20 carbon atoms; X is --O--, --O--CO--O-- or direct bond; A.sub.1 and A.sub.2 are independently cyclic groups (such as phenylene and biphenylene), said cyclic groups may be substituted with 1.about.4 fluorine, chlorine or bromine atoms, or 1 or 2 substituent groups selected from the group consisting of cyano, nitro and trifluoromethyl groups; Y is --CO--O--, --O--CO--, --C.tbd.C--, --CH.sub.2 O--, --OCH.sub.2 --, --CH.dbd.N--, --N.dbd.CH--, --N.dbd.N--, --CH.sub.2 S--, --SCH.sub.2 -- or direct bond; and * represents asymmetric atom providing optical activity.
    Type: Grant
    Filed: August 19, 1988
    Date of Patent: May 1, 1990
    Assignees: NEC Corporation, Sanyo Chemical Industries, Ltd.
    Inventors: Toyokazu Nakamura, Yuzi Kato, Shohei Naemura, Chizuka Tani, Masahiro Satoh, Kunikiyo Yoshio, Hiroshi Kishiki, Hiroshi Hoshino