US4029594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel liquid crystal compounds and electro-optic devices incorporating them
Assignee: RCA Corp
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Filing: 1976-06-17
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Granted: 1977-06-14
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Expires: 1996-06-17
Abstract
Abstract Liquid crystal compounds of the formula ##STR1## wherein X can be alkyl (R-), alkoxy (RO-), acyloxy ##STR2## or alkylcarbonato ##STR3## wherein R is an alkyl group from 1-10 carbon atoms, and R 1 -R 3 can be hydrogen, methyl or halogen with the proviso that at least one and no more than two of R 1 -R 3 are substituents other than hydrogen, have positive dielectric anisotropy and are useful in electro-optic devices which comprise a thin liquid crystal layer between two closely spaced parallel electrodes.
Inventors
- 👤 Dragan Milan Gavrilovic
- 👤 Daniel Louis Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:51
CPC Classifications
C; C07; C07C; C07C255/00; C07C37/00; C07C37/01; C07C37/055; C07C37/0555; C07C45/00; C07C45/45; C07C45/46; C07C45/61; C07C45/67; C07C45/68; C07C45/70; C07C45/71; C07C49/00; C07C49/76; C07C49/80; C07C49/813; C07C65/00; C07C65/01; C07C65/03; C07C65/21; C07C65/24; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
86 words
In an electro-optic cell comprising a liquid crystal layer between two electrodes, the improvement which comprises emloying as the liquid crystal a compound of the formula ##STR23## wherein X can be an alkyl, (R) alkoxy (OR), acyloxy ( ##STR24## or alkylcarbonate ( ##STR25## group wherein R is a alkyl group containing carbon atoms and R 1 -R 3 can be hydrogen, methyl or halogen with the proviso that at least one and no more than two of R 1 -R 3 are substituents other than hydrogen.
Claim 2
Dependent Claim
86 words
In an electro-optic cell comprising a liquid crystal layer between two electrodes, the improvement which comprises emloying as the liquid crystal a compound of the formula ##STR23## wherein X can be an alkyl, (R) alkoxy (OR), acyloxy ( ##STR24## or alkylcarbonate ( ##STR25## group wherein R is a alkyl group containing carbon atoms and R 1 -R 3 can be hydrogen, methyl or halogen with the proviso that at least one and no more than two of R 1 -R 3 are substituents other than hydrogen.
Claim 3
Dependent Claim
12 words
An electro-optical cell according to claim 1 wherein both electrodes are transparent.
Claim 4
Dependent Claim
64 words
A liquid crystal compound having the formula ##STR26## wherein X can be alkyl (R-), alkoxy (-OR), acyloxy ##STR27## or alkylcarbonato ##STR28## group wherein R is an alkyl group containing 1-10 carbon atoms and R 1 -R 3 can be hydrogen, methyl or halogen with the proviso that at least one and no more than two of R 1 -R 3 substituents other than hydrogen.
Claim 5
Dependent Claim
64 words
A liquid crystal compound having the formula ##STR26## wherein X can be alkyl (R-), alkoxy (-OR), acyloxy ##STR27## or alkylcarbonato ##STR28## group wherein R is an alkyl group containing 1-10 carbon atoms and R 1 -R 3 can be hydrogen, methyl or halogen with the proviso that at least one and no more than two of R 1 -R 3 substituents other than hydrogen.
Claim 6
Dependent Claim
11 words
A compound according to claim 3 wherein R 1 is chlorine.
Claim 7
Dependent Claim
11 words
A compound according to claim 3 wherein R 1 is methyl.
Claim 8
Dependent Claim
16 words
A compound according to claim 3 wherein R 2 is hydrogen and R 3 is methyl.
Claim 9
Dependent Claim
20 words
A compound according to claim 3 wherein R 1 is chlorine, R 2 is hydrogen and R 3 is methyl.
Claim 10
Dependent Claim
20 words
A compound according to claim 3 wherein R 1 is methyl, R 2 is hydrogen and R 3 is methyl.
Claim 11
Dependent Claim
1 words
4-Cyano-4'-biphenyl(4-hexanoyloxy-2-chloro)benzoate.
Claim 12
Dependent Claim
1 words
4-Cyano-4'-biphenyl(4-hexanoyloxy-2-chloro)benzoate.
References Cited (Backward Citations)
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US3836478A
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US3947375A
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JPS4995880A
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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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |