Patents by Inventor Sakao Kanbe

Sakao Kanbe 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).

  • (2'-Cyano-4'-n-alkyl)phenyl-3-chloro-4-n-alkoxy benzoates and liquid crystal compositions thereof
    Patent number: 4279771
    Abstract: A new ester compound suitable for use in a liquid crystal composition is provided. The compound is a (2'-cyano-4'-alkyl)phenyl-3-chloro-4 alkoxybenzoate represented by the following formula: ##STR1## wherein R and R' are selected from straight-chain alkyl groups having from one to eight carbon atoms. The ester is not a liquid crystal compound, but upon addition to a liquid crystal composition increases the absolute value of the dielectric anisotropy in the high frequency range. Such compositions are particularly well suited for the two frequency matrix-addressing drive in a liquid crystal display for complex character and graphic displays. The esters are prepared by condensing an acid chloride having the general formula ##STR2## and a phenol having the general formula ##STR3## wherein R and R' are as defined above.
    Type: Grant
    Filed: January 23, 1980
    Date of Patent: July 21, 1981
    Assignee: Kabushiki Kaisha Suwa Seikosha
    Inventors: Yoshio Shionozaki, Sakao Kanbe, Katsumori Takei