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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Nakagawa; Etsuo
Address:
Chiba, JP
No. of patents:
75
Patents:


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Patent Number Title Of Patent Date Issued
7081279 Alkenyl compound having a negative .DELTA..epsilon. value, liquid crystal composition, and liqui July 25, 2006
Liquid crystalline compounds having a large negative .DELTA..epsilon. low viscosity, a large K.sub.33/K.sub.11 value, a small .DELTA..epsilon./.DELTA..perp. and mutually excellent solubility even at low temperature, compositions containing at least one of the compounds and liquid cry
6692657 Alkenyl compound having a negative .DELTA..epsilon. value, liquid crystal composition, and liqui February 17, 2004
Liquid crystalline compounds having a large negative .DELTA..di-elect cons. low viscosity, a large K.sub.33 /K.sub.11 value, a small .DELTA..di-elect cons./.DELTA..perp. and mutually excellent solubility even at low temperature, compositions containing at least one of the compounds and
6685995 Ester compounds, liquid crystal compositions and liquid crystal display devices February 3, 2004
Liquid crystalline compounds suitable for driving at a low voltage and at a wide temperature range, and suitable for high speed response, liquid crystal compositions comprising the compound, and liquid crystal display devices comprising the liquid crystal composition. The crystalline
6649227 Difluorovinyl compound, liquid crystal composition and liquid crystal display November 18, 2003
Provided are liquid crystalline compounds having a wide liquid crystal phase temperature range, low viscosity, a large elastic constant ratio K.sub.33 /K.sub.11 and excellent solubility at low temperature, a liquid crystal composition using the same and a liquid crystal display. Preferre
6576303 Liquid crystal compounds exhibiting negative anisotropy of permittivity June 10, 2003
Novel liquid crystal compound having a negative and absolutely large value of dielectric anisotropy, being excellent in compatibility with other liquid crystalline compounds at a low temperature and being stable chemically and physically, as well as a liquid crystal composition compr
6572938 Liquid crystal composition and liquid crystal display device June 3, 2003
The present invention is to provide a liquid crystal composition which has particularly a high upper limit temperature of a nematic phase, a low lower limit temperature of the nematic phase and a small birefringence while satisfying general characteristics required for the liquid crystal
6558758 Liquid crystal composition and liquid crystal display element May 6, 2003
The present invention provides a liquid crystal composition with the characteristics satisfying various properties required for AM-LCD and having a suitable value of .alpha.n in compliance with a cell thickness, particularly a negative and absolutely large value of dielectric anisotr
6548126 2,3-difluorophenyl derivative having negative dielectric anisotropy, liquid crystal composition, April 15, 2003
The invention is to provide liquid crystalline compounds having a negative and extremely large dielectric anisotropy value and a small optical anisotropy value at the same time; liquid crystal compositions comprising the compound; and liquid crystal display devices fabricated by using th
6500503 Cyclohexane derivatives, liquid crystal compositions comprising the same and liquid crystal disp December 31, 2002
Liquid crystalline compounds are disclosed which have large dielectric anisotropy and relatively low viscosity, and which are represented by formula (1) ##STR1##wherein R.sup.1 represents hydrogen or C.sub.1 -C.sub.15 alkyl in which one or more non-adjacent methylene may be replaced
6500502 Liquid crystal composition and liquid crystal display element December 31, 2002
A liquid crystal composition having material properties for an STN mode, a low threshold voltage, a small temperature dependency thereat, a high stability to heat and ultraviolet rays, and a small frequency dependency of a dielectric anisotropy (.DELTA..epsilon.) at a low temperature. Th
6497929 Liquid crystal composition and liquid crystal display device December 24, 2002
A liquid crystal composition having a high voltage holding ratio especially at a high temperature region, a wide range of a liquid crystal phase, low viscosity, and properly large .DELTA.n, while satisfying general characteristics required for the liquid crystal composition of the AM-LCD
6495219 Liquid crystal composition and liquid crystal display device December 17, 2002
Liquid crystal compositions are disclosed which have low threshold voltage, small temperature dependence of the threshold voltage, high stability against heat and ultraviolet rays, and small frequency dependence of dielectric anisotropy (.DELTA..di-elect cons.) at low temperature while
6485799 Aniline derivatives, liquid-crystal composition containing the same, and liquid-crystal display November 26, 2002
A aniline derivative represented by general formula (1) ##STR1##wherein R and R' represent independently each other alkyl with 1 to 10 carbon, alkoxyalkyl with 1 to 10 carbon, or hydrogen; x represents cyano, halogen, haloalkyl, haloalkyloxy, or 2-cyanoethynyl; Y represents fluorine
6458433 Difluorophenyl derivatives, liquid-crystal compounds, and liquid-crystal composition October 1, 2002
Disclosed are liquid crystalline compounds which (i) are characterized in that the compounds have a wide temperature range in which the compounds exhibit a liquid crystal phase, are low in viscosity, and have a negative and large .DELTA..epsilon., (ii) are readily mixed with other variou
6399164 Liquid crystal composition and liquid crystal display element June 4, 2002
The present invention provides a liquid crystal composition comprising a component I comprising at least one compound selected from the group of compounds represented by Formula (I) and a component II comprising at least one compound selected from the group of compounds represented by
6372153 Fluoroalkoxybenzene derivatives having ether bond, liquid-crystal composition, and liquid-crysta April 16, 2002
Liquid crystalline compounds superior in having an eminent dielectric anisotropy, being stable against environment and having improved miscibility with other liquid crystalline compounds, as well as a liquid crystal composition with driving-ability at a low voltage and responsibility
6348244 Liquid-crystal compounds having large negative value of permittivity anisotropy, liquid-crystal February 19, 2002
An object of the present invention is to provide novel liquid crystalline compounds having a negative and extremely large dielectric anisotropy value and a small optical anisotropy value together, to provide liquid crystal compositions comprising the liquid crystalline compound, and to
6337034 Vinylene compounds and liquid-crystal composition January 8, 2002
Liquid crystalline compounds which have a wide temperature range of liquid crystal phase, low viscosity, and improved threshold voltage; liquid crystal compositions; and liquid crystal display devices comprising the composition can be provided; and the liquid crystalline compounds are
6333080 Liquid-crystal alkenyltolan derivative, liquid-crystal composition, and liquid-crystal display e December 25, 2001
A liquid crystalline alkenyltolan derivative expressed by the general formulawherein A.sub.1, A.sub.2, A.sub.3, and A.sub.4 independently represent a 1,4-cyclohexylene, 1,4-phenylene in which one or two hydrogen atoms may be replaced by a fluorine atom(s), dioxane-2,5-diyl, or pyrimidine
6329027 Chlorobenzene derivatives, liquid-crystal composition, and liquid-crystal display elements December 11, 2001
Provided are liquid crystalline compounds having excellent physical properties and being excellent in miscibility with other liquid crystal materials; liquid crystal compositions comprising the crystalline compound; and liquid crystal display device fabricated by using the liquid cry
6326065 Pyrimidine derivative, liquid crystal composition comprising the derivative, and liquid crystal December 4, 2001
Liquid crystalline compounds having a comparatively high voltage holding ratio, high .DELTA.n and high .DELTA..epsilon., and excellent miscibility with known liquid crystalline compounds at low temperatures. The novel compounds have the formula (1) ##STR1##wherein R represents hydrog
6325949 Liquid crystal composition and liquid crystal display element December 4, 2001
The present invention provides a liquid crystal composition comprising a component A being at least one compound selected from the group of compounds represented by Formulas (1-1) and (1-2) described in the specification and a component B being at least one compound selected from the
6319570 Liquid crystalline compound, liquid crystal composition comprising the liquid crystal-line compo November 20, 2001
The invention is to provide liquid crystalline compounds which have a low viscosity, high negative dielectric anisotropy, high resistivity, and high voltage holding ratio, and are stable against heat and ultraviolet light; to provide liquid crystal compositions comprising the liquid crys
6315922 Liquid crystal composition and liquid crystal display element November 13, 2001
The present invention provides a liquid crystal composition comprising a component A being at least one compound selected from the group of compounds represented by Formulas (1-1) and (1-2) in the specification and a component B being at least one compound selected from the group of
6248260 Liquid-crystal compounds having fluorinated alkyl groups, liquid-crystal composition, and liquid June 19, 2001
Provided are liquid crystalline compounds which are excellent in the miscibility with existing liquid crystalline compounds even at low temperatures and are electrically and chemically stable while having a high voltage holding ratio and a high .DELTA..di-elect cons.; liquid crystal
6231934 Alkenyl compound, liquid crystal composition, and liquid crystal display device May 15, 2001
The liquid crystalline compound is expressed by the general formula (1)wherein Ra represents an alkenyl group having 2 to 20 carbon atoms or an alkyl group having 1 to 20 carbon atoms any methylene group (--CH.sub.2 --) in the alkenylene or alkyl group may be replaced by --O--, --S--, --
6210761 Liquid crystal compounds exhibiting negative anisotropy of permittivity, liquid crystal composit April 3, 2001
The present invention is to provide liquid crystalline compounds which exhibit a negative dielectric anisotropy value, have an extremely high voltage holding ratio and a low threshold voltage, are remarkably small in their dependency on temperature, hardly exhibit smectic phase, and are
6210603 Fluorine-substituted benzene derivative, liquid-crystal composition, and liquid-crystal display April 3, 2001
Liquid crystalline compounds are provided which have an extremely high voltage holding ratio, altered only slightly by change of temperature, and which have a low threshold voltage and a high .DELTA.n. Also provided are liquid crystal compositions containing the liquid crystalline compou
6207076 Fluorovinyl derivative compound, liquid crystal composition, and liquid crystal display device March 27, 2001
There are herein disclosed a fluorovinyl derivative compound represented by the general formula (1) and having characteristics of a liquid crystal, a liquid crystal composition, and a liquid crystal display device formed by using this composition: ##STR1##wherein R.sub.1 is an alkyl
6207075 Liquid crystal composition and liquid crystal display element March 27, 2001
A liquid crystal composition which has a superior voltage transmittance (sharpness) for good color and high-speed response characteristics. The composition contains at least one of the following first component (I-a, I-b), second component (II-a to II-d) and third component (III-a to III
6197217 3,3'-difluorobiphenyl derivatives, liquid crystal compositions, and liquid crystal display eleme March 6, 2001
Liquid crystalline compounds which exhibit a negative dielectric anisotropy value, have an extremely high voltage holding ratio and a low threshold voltage, are small in their dependency on temperature, hardly exhibit smectic phase, and are excellent in miscibility with other liquid crys
6190576 Liquid crystal compounds, liquid crystal compostions containing the compounds, and liquid crysta February 20, 2001
The invention is to provide liquid crystalline compounds which have a low viscosity, high negative dielectric anisotropy, high resistivity, and high voltage holding ratio, and are stable against heat and ultraviolet light; to provide liquid crystal compositions comprising the liquid crys
6180027 Bisalkenyl derivatives, liquid crystalline compounds and liquid crystal compositions January 30, 2001
Liquid crystalline compounds expressed by the following formula (1), liquid crystal compositions thereof obtained by combination with specified liquid crystal compounds, and liquid crystal display devices using them, ##STR1##wherein, A.sub.1, A.sub.2, A.sub.3 and A.sub.4 denote each inde
6177154 Alkoxybenzene derivative, liquid-crystal composition, and liquid-crystal display element January 23, 2001
Disclosed are(a) liquid crystalline compounds which are essential as component of the liquid crystal compositions, are excellent in miscibility with other liquid crystal compositions, particularly in the miscibility at low temperatures, and expressed by the general formula (1) ##STR1
6174459 Difluorophenyl derivative compound, liquid crystal composition and liquid crystal display device January 16, 2001
A difluorophenyl derivative compound having characteristics of a liquid crystal represented by the following general formula (1), a liquid crystal composition and a liquid crystal display device in which the composition is used: ##STR1##wherein R.sub.0 is an alkyl group or an alkenyl
6174458 Tetracyclic compound having lateral halogen substituent and liquid crystal composition comprisin January 16, 2001
A tetracyclic compound expressed by the following general formula (1) ##STR1##wherein H.sub.1 to H.sub.12 represent hydrogen atom at least one of which is replaced by a halogen atom, when either H.sub.6 or H.sub.8 is replaced by a halogen atom, at least one of the remaining hydrogen atom
6168839 Cyclohexane derivatives, liquid-crystal composition, and liquid-crystal display element January 2, 2001
Novel liquid crystalline compounds which have a wide temperature range of liquid crystal phase, are excellent in miscibility with other liquid crystalline compounds, have a low viscosity, are low in toxicity, and are safe; liquid crystal compositions comprising the liquid crystalline
6149838 Conjugated nitrile derivative, liquid crystal composition, and liquid crystal display elements November 21, 2000
Liquid crystalline compounds having a wide temperature range of liquid crystal phase, a high dielectric anisotropy, and a high optical anisotropy; and liquid crystal compositions and display devices containing the composition. The liquid crystalline compounds are conjugated nitrile d
6143198 Liquid crystalline compounds having exo-methylene site and liquid crystal compositions comprisin November 7, 2000
A liquid crystalline compound represented by the general formula (1) ##STR1## wherein R.sub.1 represents an alkyl or alkoxy group having 1 to 10 carbon atoms, a cyano group, a halogen atom, or an alkyl or alkoxy halide group having 1 to 4 carbon atoms; R.sub.2 represents an alkyl gro
6117360 Liquid crystal composition and liquid crystal display device September 12, 2000
Liquid crystal compositions which have excellent miscibility at low temperatures, a properly large optical anisotropy, and a small threshold voltage while satisfying various characteristics required of liquid crystal compositions for active matrix mode liquid crystal display devices.
6086964 Liquid crystalline compound having dienyl moiety and liquid crystal composition July 11, 2000
The present invention is to provide a liquid crystallineThe present invention is concerned with a liquid crystalline compound expressed by general formula (1) ##STR1## wherein R.sub.1 represents cyano group, halogen atom, or a straight or branched alkyl group or halogenated alkyl gro
6051288 Fluorine-substituted liquid-crystal compound, liquid-crystal composition and liquid-crystal disp April 18, 2000
An object of the present invention is to provide a novel liquid crystalline compound having a large dielectric anisotropy, small change in threshold voltage depending on temperature, and an improved solubility to other liquid crystal materials at low temperatures, and expressed by the
6030545 Tercyclohexane, liquid-crystalline compound and liquid crystal composition comprising same February 29, 2000
The present invention provides a liquid-crystalline compound which has a reduced viscosity, a wide liquid crystal temperature range (high clearing point), a high chemical stability (extremely high specific resistance, high voltage holding ratio) and a high solubility with other liqui
6015508 Liquid crystalline compounds containing hydrocarbon groups, liquid crystalline compositions, and January 18, 2000
Disclosed are (A) a liquid crystalline compound of the general formula: ##STR1## wherein X.sub.1 stands for a hydrogen atom, cyano group, a halogen atom, or an alkyl group with 1-20 carbon atoms, and one or more methylene groups in the alkyl group may be replaced by --CH.dbd.CH--, --
6013198 Liquid crystalline compound replaced by fluorine containing group, liquid crystal composition, a January 11, 2000
Liquid crystalline compounds are disclosed which compounds are expressed by general formula (1) ##STR1## wherein R.sub.1 represents an alkyl group having 1 to 10 carbon atoms, ring A represents 1,4-phenylene or 1,4-cyclohexylene, each of X.sub.1, X.sub.2, X.sub.3, and X.sub.4 ind
6001275 Liquid-crystalline compound having dienyl moiety and liquid-crystal composition December 14, 1999
The present invention is concerned with a liquid crystalline compound expressed by general formula (1) ##STR1## wherein R.sub.1 represents cyano group, halogen atom, or a straight or branched alkyl group or halogenated alkyl group having 1 to 20 carbon atoms, one or not-adjacent
5993690 Organosilicon compound, liquid crystal composition, and liquid-crystal display element November 30, 1999
An object of the present invention is to provide organosilicon compounds having an excellent miscibility with other liquid crystal materials, low viscosity, and improved threshold voltage; to provide liquid crystal compositions comprising the organosilicon compound; and to provide liquid
5989452 Fluoroalkenyl derivative and liquid crystal composition November 23, 1999
The present invention is to provide liquid crystalline compounds having a wide temperature range of a liquid crystal phase, low viscosity, and large ratio of elastic constants; liquid crystal compositions comprising the compound; and liquid crystal display devices comprising the composit
5976408 Acrylonitrile derivative, liquid crystal composition, and liquid crystal display device November 2, 1999
An acrylonitrile derivative expressed by the following general formula I, a composition comprising the derivative and having an improved viscosity and optical anisotropy, and a liquid crystal display device: ##STR1## wherein rings A.sup.1 to A.sup.3 represent phenylene, cyclohexylene
5948318 Liquid crystal composition and liquid crystal display device September 7, 1999
Liquid crystal compositions which have a low threshold voltage, excellent miscibility at low temperatures, and a wide range of a nematic phase while satisfying various characteristics required of liquid crystal compositions for active matrix mode liquid crystal display devices. The compo
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