Patents by Inventor Ichiro Kawamrua

Ichiro Kawamrua 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
    Patent number: 5424005
    Abstract: A composition of (R)-isomer and (S)-isomer of a liquid crystal compound represented by the formula; ##STR1## wherein X represents --O-- or a direct bond, Z represents a halogen-substituted alkyl group selected from a group consisting of --CF.sub.3, --CHF.sub.2, --CH.sub.2 F, --C.sub.2 F.sub.5, --CClF.sub.2, -CCl.sub.2 F, --CCl.sub.2 CF.sub.3, and --C.sub.3 F.sub.7, m represents an integer of from 1 to 20, n represents an integer of from 1 to 20, and * represents an asymmetric carbon, and the optical purity of said composition is high enough to exhibit optically tristable states in S*(3) phase when electric voltage is applied.
    Type: Grant
    Filed: June 30, 1992
    Date of Patent: June 13, 1995
    Assignee: Showa Shell Sekiyu K.K.
    Inventors: Yoshiichi Suzuki, Hiroyuki Mogamiya, Ichiro Kawamrua