US4003633A
Expired / Lapsed
US
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Color display device
Assignee: Panasonic Holdings Corp
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Filing: 1975-11-19
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Granted: 1977-01-18
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Expires: 1995-11-19
Abstract
Abstract This invention relates to a novel color display device comprising a pair of electrodes, which are disposed with a specified space inbetween and at least one of which is transparent, and a liquid crystal solution filled in the space, wherein the improvement is that the liquid crystal solution contains a specified small amount of a new styryl-like color-changing compound represented by the chemical formula: ##STR1## In the chemical formula; Q represents a benzene ring with or without substituted radicals and/or condensed ring(s); R 1 and R 2 represent lower alkyl radicals, hydroxyalkyl radicals or alkoxyalkyl radicals of the same or different kind; R 3 represents hydrogen, an alkyl radical, alkoxy radical, halogen, a nitrile radical, an aromatic radical or a phenoxy radical; Y represents oxygen (O) or sulfur (S); Z represents an alkylene radical of 2 to 4 carbon atoms with or without alkyl substitution radical(s), necessary to form a ring structure together with ##STR2## A represents a condensation reaction residue of an aromatic aldehyde, heterocyclic aldehyde, aromatic nitroso compound, or heterocyclic nitroso compound.
Inventors
- 👤 Akio Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:51
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/14; C09B23/145; C09B23/10; C09B23/107; C09K; C09K19/00; C09K19/52; C09K19/60; C09K2323/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
56 words
A color display device comprising a pair of electrodes which are disposed with a specified space therebetween, at least one of said electrodes being transparent, and a solution filled in the space, wherein the improvement is that the solution includes a liquid crystal and dissolved therein a styryl-like color-changing dye represented by the chemical formula: ##STR27##
Claim 2
Dependent Claim
56 words
A color display device comprising a pair of electrodes which are disposed with a specified space therebetween, at least one of said electrodes being transparent, and a solution filled in the space, wherein the improvement is that the solution includes a liquid crystal and dissolved therein a styryl-like color-changing dye represented by the chemical formula: ##STR27##
Claim 3
Dependent Claim
15 words
wherein Q represents a benzene ring with or without substituted radicals or Q represents ##STR28##
Claim 4
Dependent Claim
15 words
wherein Q represents a benzene ring with or without substituted radicals or Q represents ##STR28##
Claim 5
Dependent Claim
159 words
R 1 and R 2 represent a member selected from the group consisting of lower alkyl radicals, hydroxy-alkyl radicals and alkoxy-alkyl radicals; R 3 represents a member selected from the group consisting of hydrogen, alkyl radicals, alkoxy-radicals, halogen, a nitrile radical, aromatic radicals and phenoxy radicals, Y represents a member selected from the group consisting of oxygen and sulfur; Z represents an unsubstituted or alkyl substituted alkylene radical of 2 to 4 carbon atoms which alkylene radical forms a ring structure together with ##STR29##and A represents the radical formed when said dye is produced by a condensation reaction of the methyl radical or methylene radical in the 2- position of a precursor indoline derivative represented by the formula: ##STR30##where Q, R 1 , R 2 , R 3 , Y and Z are defined as in formula (I) above with a member selected from the group consisting of aromatic aldehydes, heterocyclic aldehydes, aromatic nitroso compounds and heterocyclic nitroso compounds.
Claim 6
Dependent Claim
159 words
R 1 and R 2 represent a member selected from the group consisting of lower alkyl radicals, hydroxy-alkyl radicals and alkoxy-alkyl radicals; R 3 represents a member selected from the group consisting of hydrogen, alkyl radicals, alkoxy-radicals, halogen, a nitrile radical, aromatic radicals and phenoxy radicals, Y represents a member selected from the group consisting of oxygen and sulfur; Z represents an unsubstituted or alkyl substituted alkylene radical of 2 to 4 carbon atoms which alkylene radical forms a ring structure together with ##STR29##and A represents the radical formed when said dye is produced by a condensation reaction of the methyl radical or methylene radical in the 2- position of a precursor indoline derivative represented by the formula: ##STR30##where Q, R 1 , R 2 , R 3 , Y and Z are defined as in formula (I) above with a member selected from the group consisting of aromatic aldehydes, heterocyclic aldehydes, aromatic nitroso compounds and heterocyclic nitroso compounds.
Claim 7
Dependent Claim
21 words
A color display device according to claim 1 wherein the liquid crystal solution further contains at least one surface active agent.
Claim 8
Dependent Claim
37 words
A color display device according to claim 1 wherein at least one of said electrodes has a coating of a film of a dielectric substance which is disposed to isolate said electrode from the liquid crystal solution.
Claim 9
Dependent Claim
27 words
A color display device according to claim 1 wherein the liquid crystal solution further contains a stabilizing agent selected from the group consisting of phenols and quinones.
Claim 10
Dependent Claim
27 words
A color display device according to claim 2 wherein the liquid crystal solution further contains a stabilizing agent selected from the group consisting of phenols and quinones.
Claim 11
Dependent Claim
28 words
A color display device according to claim 2 wherein the concentration of said surface active agent is between 1×10 - 4 and 1 mol/l of liquid crystal solution.
Claim 12
Dependent Claim
29 words
A color display device according to claim 4 wherein the concentration of said stabilizing agent is between 1×10 - 3 and 1×10 - 2 mol/l of liquid crystal solution.
References Cited (Backward Citations)
US3597044A
Cited
US3703329A
Cited
US3876286A
Cited
US3888566A
Cited
US3900248A
Cited
US3864022A
Cited
US3865469A
Cited
US3833287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |