Patents by Inventor Kiyohumi Takeuchi
Kiyohumi Takeuchi 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).
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Patent number: 5536443Abstract: A liquid crystal display comprising a compound of the formula ##STR1## wherein each of Y.sup.1 and Y.sup.2 is independently F, Cl, CN, OCN, SCN, OCF.sub.3, OCF.sub.2 H, OCF.sub.2 CF.sub.3, CF.sub.3, R, --OR, --COOR or --OCOR, wherein R is alkyl, alkenyl or alkoxyalkyl, provided that at least one of Y.sup.1 and Y.sup.2 is R, --OR, --COOR or --OCOR; each of Z, Z.sup.1, Z.sup.2, Z.sup.3 and Z.sup.4 is independently a single bond. CH.sub.2 CH.sub.2 --, --CH.dbd.CH--, --C.dbd.C--, --COO--, --OCO--, --CH.sub.2 O--, OCH.sub.2 --, --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.3 --O-- or --O--(CH.sub.2).sub.3 --: ring A is a group of formula (II): ##STR2## wherein each of X.sup.1, X.sup.2, X.sup.3, X.sup.4, X.sup.5, X.sup.6, X.sup.7, X.sup.8, X.sup.9, and X.sup.Type: GrantFiled: April 25, 1995Date of Patent: July 16, 1996Assignee: Dainippon Ink & Chemicals, Inc.Inventors: Haruyoshi Takatsu, Sadao Takehara, Kiyohumi Takeuchi, Masashi Osawa, Shinji Ogawa, Norie Ishida
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Patent number: 5474707Abstract: A cyclic hydrocarbon derivative represented by formula (I): ##STR1## wherein each of Y.sup.1 and Y.sup.2 is independently F, Cl, CN, OCN, SCN, OCF.sub.3, OCF.sub.2 H, OCF.sub.2 CF.sub.3, CF.sub.3, R, --OR, --COOR or --OCOR, wherein R is alkyl, alkenyl or alkoxyalkyl, provided that at least one of Y.sup.1 and Y.sup.2 is R, --OR, --COOR or --OCOR; each of Z, Z.sup.1, Z.sup.2, Z.sup.3 and Z.sup.4 is independently a single bond, --CH.sub.2 CH.sub.2 --, --CH.dbd.CH--, --C.tbd.C--, --COO--, --OCO--, --CH.sub.2 O--, OCH.sub.2 --, --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.3 --O-- or --O--(CH.sub.2).sub.3 --; ring A is group of formula (II): ##STR2## wherein each of X.sup.1, X.sup.2, X.sup.3, X.sup.4, X.sup.5, X.sup.6, X.sup.7, X.sup.8, X.sup.9, and X.sup.Type: GrantFiled: July 21, 1994Date of Patent: December 12, 1995Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Haruyoshi Takatsu, Sadao Takehara, Kiyohumi Takeuchi, Masashi Osawa, Shinji Ogawa, Norie Ishida
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Patent number: 5321169Abstract: A novel tetracyclic cyclohexylcyclohexene derivatives represented by formula: ##STR1## wherein ##STR2## n, X and Y are as defined in the specifications, are disclosed. The compounds are useful as electroptic display materials.Type: GrantFiled: May 11, 1993Date of Patent: June 14, 1994Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Yasuyuki Tanaka, Haruyoshi Takatsu, Kiyohumi Takeuchi, Yuji Tamura
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Patent number: 5304323Abstract: A liquid crystal device comprising a pair of substrate, at least one of them being transparent, and a light-control layer supported therebetween, wherein said light-control layer comprises a liquid crystal material showing positive dielectric anisotropy and a transparent solid substance, said liquid crystal material forming a continuous phase, and said transparent solid substance existing in said continuous phase in the form of dispersed particles or a three-dimensional network. The device exhibits a clear threshold voltage, a high fast response time and a highly contrast display with a low applied voltage.Type: GrantFiled: December 1, 1992Date of Patent: April 19, 1994Assignees: Dainippon Ink and Chemicals, Inc., Kawamura Institute of Chemical ResearchInventors: Yoshi Arai, Toru Fujisawa, Kiyohumi Takeuchi, Haruyoshi Takatsu, Koichiro Adachi, Hiroshi Ogawa, Kazunori Maruyama
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Patent number: 5089629Abstract: A compound represented by formula (I): ##STR1## wherein wherein R represents a straight chain alkyl group having from 1 to 9 carbon atoms; ##STR2## represents ##STR3## X represents a hydrogen atom or a fluorine atom; and ##STR4## has a trans (equatorial-equatorial) configuration, is disclosed. The compound of formula (I) exhibits a nematic phase in the vicinity of room temperature or in a temperature range higher than room temperature and has a small optical anisotropy and a positive dielectric anisotropy and is, therefore, useful in preparing a liquid crystal display cell excellent in viewing-angle characteristics.Type: GrantFiled: August 13, 1990Date of Patent: February 18, 1992Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Yasuyuki Tanaka, Haruyoshi Takatsu, Kiyohumi Takeuchi, Yuuji Tamura
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Patent number: 4961874Abstract: Novel optically active tolan derivative represented by the general formula (I) and process for preparing thereof; ##STR1## (wherein all the symbols are the same as defined in the appended claims) are disclosed. These are effective for use in preparation of liquid crystal material capable of effectively preventing the formation of the cross-talk phenomenon due to changes due to temperature in the high level multiplexing driving system.Type: GrantFiled: November 10, 1988Date of Patent: October 9, 1990Assignee: Dainippon Ink & Chemicals, Inc.Inventors: Kiyohumi Takeuchi, Makoto Sasaki, Haruyoshi Takatsu
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Patent number: 4946986Abstract: A novel tetracyclic cyclohexylcyclohexene derivatives represented by formula: ##STR1## wherein ##STR2## n, X and Y are as defined in claim 1, are disclosed. The compounds are useful as electroptic display materials.Type: GrantFiled: February 27, 1989Date of Patent: August 7, 1990Assignee: Dainippon Ink and ChemicalsInventors: Yasuyuki Tanaka, Haruyoshi Takatsu, Kiyohumi Takeuchi, Yuji Tamura
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Patent number: 4910350Abstract: A compound represented by formula (I): ##STR1## wherein R represents a straight chain alkyl group having from 1 to 9 carbon atoms; ##STR2## represents ##STR3## represents a hydrogen atom or a fluorine atom; and ##STR4## has a trans (equatorial-equatorial) configuration, is disclosed. The compound of formula (I) exhibits a nematic phase in the vicinity of room temperature or in a temperature range higher than room temperature and has a small optical anisotropy and a positive dielectric anisotropy and is, therefore, useful in preparing a liquid crystal display cell excellent in viewing-angle characteristics.Type: GrantFiled: September 28, 1988Date of Patent: March 20, 1990Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Yasuyuki Tanaka, Haruyoshi Takatsu, Kiyohumi Takeuchi, Yuuji Tamura
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Patent number: 4880936Abstract: An optically active compound represented by formula (I): ##STR1## wherein R represents a straight chain alkyl group having from 2 to 12 carbon atoms; R' represents a straight chain alkyl or alkoxy group having from 1 to 20 carbon atoms; C represents an asymmetric carbon atom; A represents ##STR2## and X and Y each represents a hydrogen atom or a fluorine atom, provided that X and Y do not simultaneously represent a fluorine atom. The compound (I) reduces a temperature dependence of the threshold voltage of a nematic liquid crystal composition when added thereto in a small amount.Type: GrantFiled: March 25, 1988Date of Patent: November 14, 1989Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Makoto Sasaki, Kiyohumi Takeuchi, Haruyoshi Takatsu
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Patent number: 4814523Abstract: A tetracyclic nematic liquid crystal compound of the following formula: ##STR1## wherein R represents a straight-chained alkyl group carrying one to seven carbon atoms; and ##STR2## has a trans (equatorial-equatorial) configuration; is disclosed. This compound has a high N-I transition temperature and a low S-N transition temperature and is highly useful as an electro-optical display material.Type: GrantFiled: May 18, 1988Date of Patent: March 21, 1989Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Yasuyuki Tanaka, Haruyoshi Takatsu, Kiyohumi Takeuchi, Yuji Tamura
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Patent number: 4814516Abstract: Optically active tolan compounds of the formula ##STR1## wherein R and R' are straight chain alkyl and n is 0 or 1, are useful in the preparation of liquid crystalline materials capable of effectively preventing cross-talk due to temperature changes in high level, multiplexing driving systems.Type: GrantFiled: June 15, 1987Date of Patent: March 21, 1989Assignee: Dainippon Ink & Chemicals, Inc.Inventors: Kiyohumi Takeuchi, Makoto Sasaki, Haruyoshi Takatsu
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Patent number: 4764636Abstract: An optically active benzoic ester derivative represented by the general formula: ##STR1## wherein R represents a straight chain alkyl group having from 1 to 20 carbon atoms; R' represents a straight chain alkyl group having from 2 to 8 carbon atoms; rings A and B each represents ##STR2## or a trans-1,4-cyclohexane ring; n represents 0 or 1; and C represents an asymmetric carbon atoms. The compounds of formula (I) are capable of providing a chiral nematic liquid crystal composition having a short spiral pitch when added to a nematic liquid crystal composition in a small amount and are useful in the production of SBE display devices having excellent performances in a high level multiplexing driving system.Type: GrantFiled: October 31, 1986Date of Patent: August 16, 1988Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Makoto Sasaki, Kiyohumi Takeuchi, Haruyoshi Takatsu
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Patent number: 4754051Abstract: A novel optically active compound of the formula ##STR1## is capable of forming a chiral nematic liquid crystal composition having short spiral pitch by adding a small amount of it to a generally nematic liquid crystal composition. The compound of this invention is useful in the manufacture of SBE display device which is excellent especially in high level multiplexing driving system.Type: GrantFiled: September 29, 1986Date of Patent: June 28, 1988Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Makoto Sasaki, Kiyohumi Takeuchi, Haruyoshi Takatsu
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Patent number: 4698177Abstract: A compound represented by the general formula ##STR1## wherein R denotes a linear alkyl group having 1 to 9 carbon atoms, A denotes ##STR2## denotes a linear alkyl group having 1 to 9 carbon atoms, and each cyclohexane ring is arranged in a trans-(equatorial-equatorial) form.Type: GrantFiled: April 11, 1986Date of Patent: October 6, 1987Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Yasuyuki Tanaka, Haruyoshi Takatsu, Kiyohumi Takeuchi
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Patent number: 4670182Abstract: A nematic liquid crystalline composition comprising(a) a compound represented by the general formula ##STR1## wherein R represents a linear alkyl group having 1 to 10 carbon atoms, and R' represents a linear alkyl group having 1 to 10 carbon atoms or a linear alkoxy group having 1 to 10 carbon atoms,(b) a compound represented by the general formula ##STR2## wherein R is as defined, and R' represents a linear alkoxy group having 1 to 10 carbon atoms,(c) at least one compound selected from compounds represented by the general formula ##STR3## wherein R is as defined, and X represents a hydrogen, fluorine or chlorine atom,and compounds represented by the general formula ##STR4## wherein R represents a linear alkyl group having 1 to 10 carbon atoms, and ##STR5## and optionally a compound represented by the general formula ##STR6## wherein R is as defined, and R' represents a linear alkoxy group having 1 to 10 carbon atoms.Type: GrantFiled: October 18, 1985Date of Patent: June 2, 1987Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Yutaka Fujita, Kiyohumi Takeuchi
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Patent number: 4654421Abstract: 4-Substituted phenyl crotyl ether derivative is disclosed, which is a novel nematic liquid crystal compound having a comparatively high N-I point and which, when preparing a practically usable mixed liquid crystal having an N-I point higher than 65.degree. C. by mixing this compound with at least one other liquid crystal compound, can minimize the increase range of the viscosity of the resulting mixed liquid crystal.Type: GrantFiled: June 16, 1986Date of Patent: March 31, 1987Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Yasuyuki Tanaka, Haruyoshi Takatsu, Kiyohumi Takeuchi
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Patent number: 4393258Abstract: 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: GrantFiled: June 10, 1982Date of Patent: July 12, 1983Assignee: Dainippon Mk & Chemicals Inc.Inventors: Hisato Sato, Haruyoshi Takatsu, Yutaka Fujita, Masayuki Tazume, Kiyohumi Takeuchi, Hiroyuki Ohnishi