Patents by Inventor Yutaka Mizukuchi

Yutaka Mizukuchi 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: 4390467
    Abstract: A liquid crystal composition comprises at least two compounds selected from the group consisting of trans-4-alkylcyclohexane-1-carboxylic acid-4'-(4"-alkylphenyl)-2'-chlorophenyl ester having the general formula: ##STR1## wherein R and R' are normal chain alkyl groups containing 2 to 7 carbon atoms, these compounds making up 30 mole % or more of the total composition, and at least one compound selected from at least one of the group consisting of 4-alkylbenzoic acid-4'-(4"-alkylphenyl)-2'-chlorophenyl ester having the general formula: ##STR2## wherein R and R' are normal chain alkyl groups containing 2 to 8 carbon atoms and the group consisting of 4-alkoxybonzoic acid-4'-(4"-alkylphenyl)-2'-chlorophenyl ester having the general formula: ##STR3## wherein R and R' are normal chain alkyl groups containing 2 to 8 carbon atoms. This composition not only have a wide nematic temperature range assuring operation at a low temperature of less than -20.degree. C. but also have a low viscosity and excellent response.
    Type: Grant
    Filed: February 23, 1982
    Date of Patent: June 28, 1983
    Assignee: Citizen Watch Co., Ltd.
    Inventor: Yutaka Mizukuchi
  • Patent number: 4216109
    Abstract: A new and novel liquid crystal composition having broad temperature and chemical stability is disclosed. The liquid crystal composition comprises a compound having the general formula: ##STR1## (R represents an alkyl or alkoxyl group and X represents an alkyl, alkoxyl, nitro or cyano group).The method for making the liquid crystal compound includes the methylation of 4-phenyl-2-chlorophenol and like compounds.
    Type: Grant
    Filed: November 14, 1978
    Date of Patent: August 5, 1980
    Assignee: Citizen Watch Co., Ltd.
    Inventor: Yutaka Mizukuchi
  • Patent number: 4138359
    Abstract: A new and novel liquid crystal composition having broad temperature and chemical stability is disclosed. The liquid crystal composition comprises a compound having the general formula: ##STR1## wherein R represents an alkyl or alkoxyl group and X represents an alkyl, alkoxyl, nitro or cyano group. The method for making the liquid crystal compound includes the methylation of 4-phenyl-2-chlorophenol and like compounds.
    Type: Grant
    Filed: February 25, 1977
    Date of Patent: February 6, 1979
    Assignee: Citizen Watch Co., Ltd.
    Inventor: Yutaka Mizukuchi