Patents by Inventor Haruyoshi Takatsu

Haruyoshi Takatsu 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).

  • 1-Cyclohexyl-2-cyclohexylphenylethane derivatives
    Patent number: 4393258
    Abstract: A 1-cyclohexyl-2-cyclohexylphenylethane derivative of the following general formula ##STR1## wherein R.sub.1 and R.sub.2, independently from each other, represent a linear alkyl group having 1 to 7 carbon atoms.
    Type: Grant
    Filed: June 10, 1982
    Date of Patent: July 12, 1983
    Assignee: Dainippon Mk & Chemicals Inc.
    Inventors: Hisato Sato, Haruyoshi Takatsu, Yutaka Fujita, Masayuki Tazume, Kiyohumi Takeuchi, Hiroyuki Ohnishi
  • Nematic liquid crystalline compounds
    Patent number: 4207252
    Abstract: A nematic liquid crystalline compound of the general formula ##STR1## wherein R.sub.1 represents a linear alkyl group containing 3 to 8 carbon atoms and R.sub.2 represents a linear alkyl g group containing 3 to 7 carbon atoms, or a cyano group, with the proviso that when R.sub.2 represents a linear alkyl group containing 3 carbon atoms, R.sub.1 does not represent a linear alkyl group containing 3 or 7 carbon atoms, and when R.sub.2 represents a cyano group, R.sub.1 does not represent a linear alkyl group containing 3 carbon atoms.
    Type: Grant
    Filed: October 27, 1978
    Date of Patent: June 10, 1980
    Assignee: Dainippon Ink & Chemicals, Inc.
    Inventors: Hisato Sato, Haruyoshi Takatsu
  • Nematic liquid crystalline materials
    Patent number: 4202791
    Abstract: Novel trans(equatorial-equatorial)1,4-disubstituted cyclohexane derivatives of the general formula ##STR1## wherein R represents a linear alkyl group containing 3 to 7 carbon atoms, and R' represents a linear alkoxy group containing 2 to 5 carbon atoms or a cyano group. These compounds are nematic liquid crystals, and a composition containing at least one of these compounds is useful as an electro-optical display material.
    Type: Grant
    Filed: February 14, 1979
    Date of Patent: May 13, 1980
    Assignee: Dainippon Ink & Chemicals Inc.
    Inventors: Hisato Sato, Haruyoshi Takatsu, Masayuki Tazume
  • 3'-Chloro-4'-cyanophenyl 4-n-alkylbenzoates
    Patent number: 4198312
    Abstract: Novel compounds of the formula ##STR1## wherein R represents a linear alkyl group containing 1 to 9 carbon atoms. When added to nematic liquid crystals for electro-optical display elements, these compounds enable the liquid crystals to be operated at low voltages.
    Type: Grant
    Filed: November 13, 1978
    Date of Patent: April 15, 1980
    Assignees: Dainippon Inc. & Chemicals, Inc., Hitachi, Ltd.
    Inventors: Hisato Sato, Haruyoshi Takatsu, Yutaka Fujita
  • Nematic liquid crystalline compounds
    Patent number: 4178302
    Abstract: Nematic liquid crystalline 4,4'-substituted derivatives of cyclohexene-1-carboxylic acid phenylthiol esters represented by the general formula ##STR1## wherein R.sub.1 is a linear alkyl group containing 3 to 7 carbon atoms, and R.sub.2 is a linear alkoxy group containing 2 to 5 carbon atoms.
    Type: Grant
    Filed: November 21, 1978
    Date of Patent: December 11, 1979
    Assignee: Dainippon Ink & Chemicals, Inc.
    Inventors: Hisato Sato, Haruyoshi Takatsu, Masayuki Tazume
  • Nematic liquid crystal composition
    Patent number: 4048089
    Abstract: A nematic liquid crystal composition comprising (I) 4-n-valeryloxy-4'-cyanobiphenyl, (II) 4-n-caproyloxy-4'-cyanobiphenyl and (III) 4'-cyanophenyl-4-n-heptylbenzoate, and either (IV) 4'-cyanophenyl-4-n-butylbenzoate or (V) 4'-cyanophenyl-4-n-nonylbenzoate, said composition having a crystal-nematic transition temperature of -40.degree. to -20.degree. C and a nematic-isotropic transition temperature of 50.degree. to 65.degree. C.
    Type: Grant
    Filed: July 6, 1976
    Date of Patent: September 13, 1977
    Assignees: Dainippon Ink & Chemicals, Inc., Kawamura Institute of Chemical Research
    Inventors: Yoshi Arai, Kazuo Kimura, Hisato Sato, Takasi Yamaki, Katsuhiko Morita, Masanao Ohzeki, Haruyoshi Takatsu, Yutaka Fujita, Masayuki Tazume