US3816336A
Expired / Lapsed
US
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Novel electro-optic devices
Assignee: RCA Corp
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Filing: 1972-06-15
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Granted: 1974-06-11
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Expires: 1992-06-15
Abstract
Abstract Electro-optic devices comprising a thin layer of a liquid crystal composition containing a compound of the formula WHEREIN R and R'' are alkyl groups of 1-7 carbon atoms between conductive support plates, offer a wide range of use temperatures.
Inventors
- 👤 M Mccaffrey
- 👤 J Castellano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:08
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/24; C09K19/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
21 words
A device according to claim 1 wherein the liquid crystal layer is between about 1/4 and about 1/2 mil in thickness.
Claim 2
Dependent Claim
17 words
A device according to claim 1 wherein the liquid crystal is a mixture of the azoxybenzene compounds.
Claim 3
Dependent Claim
22 words
A liquid crystal composition consisting essentially of a mixture of azoxybenzene compounds selected from the group consisting of compounds having the formula
Claim 4
Dependent Claim
16 words
A composition according to claim 4 wherein the mixture contains p-methoxy-p''-(3-methylpentanoyloxy)azoxybenzene, p-ethoxy-p''-butylazoxybenzene and p-methoxy-p'' -butylazoxy benzene.
Claim 5
Dependent Claim
15 words
A composition according to claim 5 wherein the azoxybenzene compounds are present in equimolar proportions.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |