US4032470A
Expired / Lapsed
US
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Electro-optic device
Assignee: RCA Corp
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Filing: 1975-12-22
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Granted: 1977-06-28
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Expires: 1995-12-22
Abstract
Abstract Novel liquid crystal dyes of the formula <IMAGE> wherein (CHOL-) is a cholesteryl radical, X can be 0 or NH, R1 can be H, -OH, methyl, fluoro or chloro; R2 can be -NO2, -CN, N-(alkyl)2, -OCOOR, -OCOR, alkyl or alkoxy and R3 can be H, methyl, fluoro or chloro, can be added to known liquid crystal compositions to impart color to the mixtures and improved contrast to a liquid crystal electro-optic device containing such mixtures.
Inventors
- 👤 Allen Bloom
- 👤 Ling Kong Hung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:58
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/0003; C07; C07J; C07J41/00; C07J41/0033; C07J41/0055; C07J41/0094; C09K; C09K19/00; C09K19/04; C09K19/36; C09K19/52; C09K19/60; C09K19/601
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
117 words
In an electro-optic device comprising a nematic liquid crystal composition between two electrodes, the improvement wherein the nematic liquid crystal composition comprises a nematic liquid crystal having dissolved therein a liquid crystal dye of the formula ##STR9## wherein (CHOL) represents a cholesteryl radical, X can be O or NH; R 1 can be hydrogen, hydroxy, methyl, fluoro or chloro; R 2 can be hydrogen, --NO 2 , --CN, --N(alkyl) 2 , alkylcarbonato, alkanoyloxy, alkyl or alkoxy; and R 3 can be hydrogen, methyl, fluoro or chloro, in such amounts that a change in the optical density of the colored nematic liquid crystal composition is produced as a function of voltage applied to said nematic liquid crystal composition.
Claim 2
Dependent Claim
117 words
In an electro-optic device comprising a nematic liquid crystal composition between two electrodes, the improvement wherein the nematic liquid crystal composition comprises a nematic liquid crystal having dissolved therein a liquid crystal dye of the formula ##STR9## wherein (CHOL) represents a cholesteryl radical, X can be O or NH; R 1 can be hydrogen, hydroxy, methyl, fluoro or chloro; R 2 can be hydrogen, --NO 2 , --CN, --N(alkyl) 2 , alkylcarbonato, alkanoyloxy, alkyl or alkoxy; and R 3 can be hydrogen, methyl, fluoro or chloro, in such amounts that a change in the optical density of the colored nematic liquid crystal composition is produced as a function of voltage applied to said nematic liquid crystal composition.
Claim 3
Dependent Claim
12 words
A device according to claim 1 wherein the dyestuff is cholesteryl 4-azophenyl-(4'-nitrobenzyl)carbonate.
Claim 4
Dependent Claim
12 words
A device according to claim 1 wherein said dyestuff is cholesteryl 4-azophenyl-(4'-cyanophenyl)carbonate.
Claim 5
Dependent Claim
13 words
A device according to claim 1 wherein said dyestuff is cholesteryl 4-phenylazophenyl carbonate.
Claim 6
Dependent Claim
12 words
A device according to claim 1 wherein said dyestuff is cholesteryl 4-(3-hydroxy)azophenyl-(4'-nitrophenyl)carbonate.
Claim 7
Dependent Claim
12 words
A device according to claim 1 wherein said dyestuff is cholesteryl 4-azophenyl-(4'-diethylaminophenyl)carbamate.
Claim 8
Dependent Claim
24 words
A device according to claim 1 wherein said nematic liquid crystal is a mixture of 4-methoxybenzylidene-4-butylaniline and 4-ethoxybenzylidene-4'-butylaniline and said dyestuff is cholesteryl 4-azophenyl-(4'-cyanophenyl)-carbonate.
Claim 9
Dependent Claim
25 words
A device according to claim 1 wherein said nematic liquid crystal is a mixture of 4-methoxybenzylidene-4'-butylaniline and -ethoxybenzylidene-4'-butylaniline and said dyestuff is cholesteryl 4-phenylazophenyl carbonate.
Claim 10
Dependent Claim
24 words
A device according to claim 1 wherein said nematic liquid crystal is a mixture of 4-methoxybenzylidene-4'-butylaniline and 4-ethoxybenzylidene-4-'-butylaniline and said dyestuff is cholesteryl 4-(3-hydroxy)azophenyl-(4'-nitrophenyl)carbonate.
Claim 11
Dependent Claim
34 words
A device according to claim 1 wherein said nematic liquid crystal comprises one or more compounds having the formula ##STR10## wherein R is an alkyl or acyl group and said dyestuff is cholesteryl 4-azophenyl-(4'-diethylaminophenyl)carbamate.
Claim 12
Dependent Claim
34 words
A device according to claim 1 wherein said nematic liquid crystal comprises one or more compounds having the formula ##STR11## wherein R is an alkyl or acyl group and said dyestuff is cholesteryl 4-azophenyl-(4'-nitrobenzyl)carbonate.
Claim 13
Dependent Claim
32 words
A device according to claim 1 wherein said nematic liquid crystal is a mixture of 4-methoxybenzylidene-4'-butylaniline, 4-ethoxybenzylidene-4'-butylaniline and one or more compounds of the formula ##STR12## wherein R is an alkyl group.
Claim 14
Dependent Claim
79 words
A nematic liquid crystal composition comprising a nematic liquid crystal and from about 0.05 to about 2% by weight of said liquid crystal of a compound of the formula ##STR13## wherein (CHOL) represents a cholesteryl radical, X can be O or NH; R 1 can be hydrogen, hydroxy, methyl, fluoro or chloro; R 2 can be hydrogen, --NO 2 , --CN, --N(alkyl) 2 , alkylcarbonato, alkanoyloxy, alkyl or alkoxy; and R 3 can be hydrogen, methyl, fluoro or chloro.
Claim 15
Dependent Claim
79 words
A nematic liquid crystal composition comprising a nematic liquid crystal and from about 0.05 to about 2% by weight of said liquid crystal of a compound of the formula ##STR13## wherein (CHOL) represents a cholesteryl radical, X can be O or NH; R 1 can be hydrogen, hydroxy, methyl, fluoro or chloro; R 2 can be hydrogen, --NO 2 , --CN, --N(alkyl) 2 , alkylcarbonato, alkanoyloxy, alkyl or alkoxy; and R 3 can be hydrogen, methyl, fluoro or chloro.
Claim 16
Dependent Claim
31 words
A nematic liquid crystal composition comprising a mixture of 4-methoxybenzylidene-4'-butylaniline and 4-ethoxybenzylidene-4'-butylaniline and a dyestuff dissolved therein selected from the group consisting of cholesteryl 4-azophenyl-(4'-cyanophenyl)carbonate, cholesteryl 4-phenylazophenyl carbonate and cholesteryl 4-(3-hydroxy)azophenyl-(4'-nitrophenyl)carbonate.
Claim 17
Dependent Claim
31 words
A nematic liquid crystal composition comprising a mixture of 4-methoxybenzylidene-4'-butylaniline and 4-ethoxybenzylidene-4'-butylaniline and a dyestuff dissolved therein selected from the group consisting of cholesteryl 4-azophenyl-(4'-cyanophenyl)carbonate, cholesteryl 4-phenylazophenyl carbonate and cholesteryl 4-(3-hydroxy)azophenyl-(4'-nitrophenyl)carbonate.
Claim 18
Dependent Claim
77 words
A nematic liquid crystal composition comprising one or more compounds having the formula ##STR14## wherein R is an alkyl group, and a dyestuff dissolved therein of the formula ##STR15## wherein (CHOL) represents a cholesteryl radical, X can be O or NH, R 1 can be hydrogen, hydroxy, methyl, fluoro or chloro; R 2 can be --NO 2 , --CN, --N(alkyl) 2 , alkylcarbonato, alkanoyloxy, alkyl or alkoxy and R 3 can be hydrogen, methyl, fluoro or chloro.
Claim 19
Dependent Claim
77 words
A nematic liquid crystal composition comprising one or more compounds having the formula ##STR14## wherein R is an alkyl group, and a dyestuff dissolved therein of the formula ##STR15## wherein (CHOL) represents a cholesteryl radical, X can be O or NH, R 1 can be hydrogen, hydroxy, methyl, fluoro or chloro; R 2 can be --NO 2 , --CN, --N(alkyl) 2 , alkylcarbonato, alkanoyloxy, alkyl or alkoxy and R 3 can be hydrogen, methyl, fluoro or chloro.
Claim 20
Dependent Claim
67 words
A nematic liquid crystal composition comprising a nematic liquid crystal and a dyestuff dissolved therein having the formula ##STR16## wherein (CHOL) represents a cholesteryl radical, X can be O or NH, R 1 can be hydrogen, hydroxy, methyl, fluoro or chloro; R 2 can be --NO 2 , --CN, --N(alkyl) 2 , alkylcarbonato, alkanoyloxy, alkyl or alkoxy and R 3 can be hydrogen, methyl, fluoro or chloro.
Claim 21
Dependent Claim
67 words
A nematic liquid crystal composition comprising a nematic liquid crystal and a dyestuff dissolved therein having the formula ##STR16## wherein (CHOL) represents a cholesteryl radical, X can be O or NH, R 1 can be hydrogen, hydroxy, methyl, fluoro or chloro; R 2 can be --NO 2 , --CN, --N(alkyl) 2 , alkylcarbonato, alkanoyloxy, alkyl or alkoxy and R 3 can be hydrogen, methyl, fluoro or chloro.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |