US4013582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal compounds and electro-optic devices incorporating them
Assignee: RCA Corp
•
Filing: 1976-06-17
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Granted: 1977-03-22
•
Expires: 1996-06-17
Abstract
Abstract Liquid crystal compounds of the formula ##STR1## wherein X can be alkoxy (RO-), acyloxy ##STR2## or alkylcarbonate ##STR3## wherein R is an alkyl group from 1-10 carbon atoms, 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
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:52
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3066; C09K19/3068
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
51 words
In an electro-optic cell comprising a liquid crystal layer between two electrodes, the improvement wherein said liquid crystal includes a compound of the formula ##STR11## wherein X is a member selected from the group consisting of RO--, ##STR12## and ##STR13## groups wherein R is an alkyl group of 1-10 carbon atoms.
Claim 2
Dependent Claim
51 words
In an electro-optic cell comprising a liquid crystal layer between two electrodes, the improvement wherein said liquid crystal includes a compound of the formula ##STR11## wherein X is a member selected from the group consisting of RO--, ##STR12## and ##STR13## groups wherein R is an alkyl group of 1-10 carbon atoms.
Claim 3
Dependent Claim
11 words
A device according to claim 1 wherein both electrodes are transparent.
Claim 4
Dependent Claim
34 words
A liquid crystal compound having the formula ##STR14## wherein X is a member selected from the group consisting of RO--, ##STR15## and ##STR16## groups wherein R is an alkyl group of 1-10 carbon atoms.
Claim 5
Dependent Claim
34 words
A liquid crystal compound having the formula ##STR14## wherein X is a member selected from the group consisting of RO--, ##STR15## and ##STR16## groups wherein R is an alkyl group of 1-10 carbon atoms.
Claim 6
Dependent Claim
12 words
A compound according to claim 3 wherein X is an RO-- group.
Claim 7
Dependent Claim
12 words
A compound according to claim 3 wherein X is an ##STR17## group.
Claim 8
Dependent Claim
12 words
A compound according to claim 3 wherein X is an ##STR18## group.
Claim 9
Dependent Claim
12 words
A compound according to claim 4 wherein X is a heptyloxy group.
Claim 10
Dependent Claim
10 words
A compound according to claim 5 wherein X is hexanoyloxy.
Claim 11
Dependent Claim
10 words
A compound according to claim 6 wherein X is butylcarbonato.
References Cited (Backward Citations)
US3947375A
Cited
US3954653A
Cited
US3952046A
Cited
DE2502904A1
Cited
US3925237A
Cited
US3925238A
Cited
US3951846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |