Matches 201 - 250 out of 292 < 1 2 3 4 5 6 >
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4457859 Mesomorphic material containing 2,2'-azoimidazole compounds containing 1,1'-benzylideneamino substituents  
2,2-azimidazole derivatives of the formula: ##STR1## wherein R and R 1 are H, a C 1 -C 12 alkyl, a C 1 -C 12 alkoxy; NO 2 ; R 2 is hydrogen, a C 1 -C 3 alkyl; n, m=1 to 3, but where n-m=1,...
4456545 Dichroitic anthraquinone dyestuffs useful in liquid crystalline dielectrics and electro-optical indicator elements  
New dichroitic dyestuffs useful as components of liquid crystalline dielectrics for electro-optical indicator elements based on the guest-host effect have the formula ##STR1## wherein W, X, Y and Z...
4455253 Pleochroic anthraquinone dyes  
An anthraquinone dye free from water-solubilizing and ionic substituents of the general formula: ##STR1## wherein Q is NH 2 , OH, alkyl, aryl, NO 2 or halo; n is 0 to 4; each X independently...
4452511 Substituted anthracene-type isotropic dyes for liquid crystal display devices  
Certain substituted anthracene-type compounds have been found to be useful as isotropic dyestuffs in guest-host combinations with nematic, cholesteric and smectic liquid crystals and other...
4448492 Cycloalkyl-type isotropic dyes for liquid crystal display devices  
Certain cycloalkyl-type compounds have been found to be useful as isotropic dyestuffs in guest-host combinations with nematic, cholesteric and smectic liquid crystals and other well-known dichroic...
4434072 Liquid crystal composition  
A liquid crystal composition comprising a host liquid crystal And a pleochroic dye dissolved therein as a guest material is described, which is characterized in that the pleochroic dye contains an...
4428858 Composition based on liquid crystal for electro-optical device  
A composition for use in an electro-optical device, particularly a display device, contains anthraquinone pleochroic dye of formula (I): ##STR1## where R 1 is a substituted or unsubstituted amino...
4426312 Liquid crystal material containing disazo dyestuffs  
Liquid crystal material containing a disazo dyestuff of formula ##STR1## in which R 1 designates alkyl, aralkyl, cycloalkyl, aryl, alkylsulphonyl, aralkylsulphonyl, cycloalkylsulphonyl,...
4414131 Guest-host liquid crystalline composition  
A novel nematic liquid crystalline composition is provided. A novel liquid crystalline chiral compound, (+)5-(2-methyl) butyl-2(4-cyanophenyl)-1, 3-dioxane, is also provided. When admixed together,...
4411812 Dichroic liquid crystal compositions made with asymmetric tris-azo dyes  
Novel asymmetric tris-azo dye compositions and a liquid crystal composition containing the asymmetric tris-azo dye compositions are disclosed. The asymmetric dye compositions having asymmetric...
4408840 Liquid crystal compositions containing pleochroic anthraquinone dyes, liquid crystal devices containing the compositions, and the dyes  
A liquid crystal composition contains a pleochroic dye which is an anthraquinone dye having the group --OCOO-- in a substituent group. Such a dye shows a reasonable order parameter and good...
4406814 Liquid crystalline materials and optical displays utilizing same  
Disclosed is a new family of Liquid Crystalline Materials for use in optical display devices having the general formula: ##STR1## The members of the family of materials are characterized by having...
4405211 Liquid crystal compositions with pleochroic anthraquinone dyes  
A material suitable for a guest-host liquid crystal device comprises a solution of a liquid crystal material and a pleochroic dye wherein the pleochroic dye comprises at least one compound having a...
4402854 Liquid crystals having pleochroic dyes  
Anthraquinone dyes of the general formula: ##STR1## wherein R 1 , R 3 , R 4 and R 6 are selected from the group consisting of H, OH, OCH 3 , NO 2 , NH 2 and NHCH 3 ; R 2 and R 5 are selected...
4401369 Class of dichroic dyes for use with liquid crystals  
A cholesteric guest-host liquid crystal composition having a positive dielectric anisotropy and consisting of a positive nematic host component, an optically active cholesteric component, and a...
4395350 Liquid crystal mixtures  
Liquid crystal mixtures containing a coloring substance which comprise about 5 to about 40 weight % of trans-p-[5-(4-alkylcyclohexyl)-2-pyrimidinyl]benzonitriles, about 10 to about 60 weight % of...
4394070 Helichromic compounds and displays  
A composition for use in liquid crystal display devices, consisting essentially of a nematic liquid crystal material and a helichromic compound possessing both a chromophoric moiety and a helical...
4391730 Nematic liquid crystal compounds and use and device for using the same  
A nematic liquid crystal for modulating light in electrooptical devices comprises: A. A 5-substituted-2-(4-substituted-phenyl)-pyrimidine of the formula ##STR1## or a homolog thereof, R 1 and R...
4389329 Meterocyclic compounds  
Pyrimidine derivatives of the formula ##STR1## wherein at least one of rings A and B is a trans-1,4-disubstituted cyclohexane ring and the other, optionally, may be aromatic and R is straight-chain...
4382012 Liquid crystalline diketones  
Diketones of the formula ##STR1## wherein R 1 is alkyl, perfluoroalkyl or alkoxy, each of 1-18 carbon atoms; R 2 is alkyl or perfluoroalkyl, each of 1-12 carbon atoms; and X is...
4378302 Red perylene dichroic dye containing liquid crystal formulations  
Liquid crystal compositions having guest perylene-based dichroic dyes dissolved therein. The perylene dichroic dyes have symmetrically-disposed substituents which are preferably a group forming...
4359398 Liquid crystal compositions with novel tris-azo dichroic dyes  
Novel tris-azo dyes and a liquid crystal composition containing the tris-azo dyes. The tris-azo dyes are of the general formula: ##STR1## wherein R 1 and R 2 are various aromatic groups including...
4358589 Nematic liquid crystal compounds  
A nematic liquid crystal compound adapted for the modulation of the transmitted or incident light and reproduction in color of numerals, symbols and images by electro-optical devices, the said...
4358392 Liquid crystal-base composition for an electro-optical device  
The liquid crystal-base composition for an electro-optical device contains an anthraquinone pleochroic coloring agent of formula (I) as defined in claim 1, that is to say, with in particular at...
4356103 Liquid crystals for electro-optical devices  
Liquid crystal compound for color modulation of light in electro-optical devices characterized by an oriented smectic C-phase with positive dielectric anisotropy. The compound has the property of a...
4350603 Novel tris-azo dyes and liquid crystal compositions made therewith  
Novel tris-azo dye compositions and a liquid crystal composition containing the tris-azo dye compositions are disclosed. The tris-azo dye composition having terminal aromatic groups has the general...
4348298 Nematic liquid crystal mixtures  
A nematic liquid crystal mixture for modulation of the transmitted or incident light and for rendition of colored numerals, symbols and images in electro-optical devices, the said mixture...
4337999 Fluorescent liquid crystal display compositions and devices  
A fluorescent liquid crystal display composition comprising a liquid crystal material absorbing little or no near ultraviolet light and a fluorescent material capable of emitting visible...
4335011 Cyclohexyl-dioxane liquid crystalline compounds  
Novel liquid crystalline compounds having low viscosity, low transition temperatures, positive dielectric anisotropy and extremely low optical birefringence are provided. The compounds are...
4323504 Cyclohexyl cyclohexyl dioxane liquid crystalline compounds and admixture containing same  
Novel liquid crystalline compounds having low viscosity, high (N-1) transition temperatures, positive dielectric anisotropy and low optical birefringence are provided and are represented by the...
4309539 Pyrimidine derivatives  
Optically active pyrimidines of the formula ##STR1## wherein Z is --(CH 2 ) n -- or --(CH 2 ) n --O-- wherein n is an integer of 1 to 4 and each of the symbols X is a nitrogen atom and each of...
4308162 Novel yellow azo dyes and dichroic liquid crystal compositions made therewith  
Novel yellow azo dye compositions and novel liquid crystal compositions containing the yellow azo dye composition. The yellow azo dye composition, having terminal ester groups, has the general...
4308164 Novel yellow azo dyes and dichroic liquid crystal composition made therewith  
Novel yellow azo dye compositions and a liquid crystal composition containing the yellow azo dye composition are disclosed. The yellow azo dye composition, having terminal ester groups has the...
4299720 Liquid crystal mixture  
A liquid crystal mixture intended for electrooptical displays having no polarizers, consisting of: a nematic liquid crystal as the host phase; an optically active additive to give the host...
4291948 Liquid crystal display incorporating positive and negative smectic material  
A liquid crystal display cell provides more than two contrasting colors that operates in a storage mode which has a positive dielectric anisotropy smectic liquid layer between electroded plates...
4288147 Electro-optical composition of the guest-host type  
The electro-optical composition comprises a host liquid crystal and guest dichroic dye which is characterized generally as a linear, noncondensed aromatic compound including one or more quinonoid...
4281903 Electro-optic passive display cell  
An electro-optic passive display device comprising a pair of plates having, as an active component between the plates, a mixture comprising a nematic liquid crystal possessing negative dielectric...
4279152 Temperature responsive device  
A liquid crystal temperature indicator that gives a visual indication of whether the device is at a temperature above or below one or more threshold values has a homeotropically aligned nematic or...
4278328 Guest-host liquid crystal display device  
A guest-host liquid crystal display device is disclosed which undergoes a focalconic-homeotropic phase transition. The device has a guest-host material layer including (a) a nematic liquid crystal...
4232950 Liquid crystal compositions including pleochroic dye  
Liquid crystal compositions containing pleochroic dyes. The pleochroic dyes are substituted anthraquinones useful in guest-host combinations with nematic liquid crystal compositions having positive...
4232949 Liquid crystal compositions containing pleochroic dye  
Liquid crystal compositions containing pleochroic dyes. The pleochroic dyes are substituted anthraquinone dyes containing at least one carbocyclic or heterocyclic group linked to the anthraquinone...
4228030 Liquid crystal compositions  
Novel liquid crystal compositions having extended temperature ranges, without sacrifice of stability, are provided by mixing 10-25%, by weight, of a terphenyl liquid crystal material with 75-90%,...
4211473 Liquid crystal display devices  
In order to provide a liquid crystal display device having enhanced contrast, pleochroic and fluorescent materials are incorporated in one or more components of the device. The materials are...
4208106 Fluorescent displays  
Fluorescent displays are comprised of a means for cooperatively aligning a liquid crystal material and a fluorescent medium disposed therein. The fluorescent medium is comprised of a nematic liquid...
4196974 Smectic liquid crystal display cell  
The invention provides a liquid crystal display cell in which particles having a preferential light absorption direction, particles which may be the molecules of a dichroic pigment, are inserted in...
4184750 Novel liquid crystal dyestuffs and electro-optic devices incorporating same  
Novel liquid crystal dyestuffs of the formula ##STR1## wherein Y and Z are different and can be nitro or cyano and --N(R) 2 wherein R is alkyl or alkylene, preferably of 1 to 4 carbon atoms, and X...
4179395 Dichroic dyes having a plurality of azo bonding groups  
Dichroic liquid crystal compositions for use in displays are mixtures of a liquid crystal host material and at least one of a plurality of dyes each having a plurality of azo (--NN--) bonding...
4176918 Fluorescent liquid crystal display  
A liquid crystal composition for improved electro-optic displays. The composition undergoes an electrically induced cholesteric-nematic phase transition and includes fluorescent materials which are...
4145114 Pleochroic dyes  
A dye compound suitable for use in solution with a liquid crystal material is characterized by one of the following formulae: ##STR1## (III) a derivative of (I) or (II) containing one or more...
4142781 Electro-optical display device with electro-optical light valves  
Electro-optical display device which may operate either in a one or multi-color mode and utilizes electro-optical light valves for controlling transmittance of a passive light through the device...
Matches 201 - 250 out of 292 < 1 2 3 4 5 6 >