US3732429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal device
Assignee: Raytheon Co
•
Filing: 1971-11-12
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Granted: 1973-05-08
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Expires: 1991-11-12
Abstract
Abstract The liquid crystal device comprises a liquid crystal layer, a thin photoconductor layer, and a thin insulator layer sandwiched between the transparent supporting covers having a transparent electrically-conductive layer thereon. The photoconductor layer is cadmium sulphide (CdS) and the insulator layer is zinc sulphide (ZnS).
Inventors
- 👤 M Braunstein
- 👤 W Bleha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:28
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/135
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
22 words
The device of claim 1 wherein said layer of high electrical impedance has an impedance in excess of 1012 ohms per square.
Claim 2
Dependent Claim
24 words
The device of claim 1 wherein said layer of liquid crystal is a layer of nematic liquid crystal operable in the dynamic scattering mode.
Claim 3
Dependent Claim
25 words
The device of claim 1 wherein said layer of liquid crystal is a layer of cholesteric-containing liquid crystal operable in the emulsion storage scattering mode.
Claim 4
Dependent Claim
28 words
The device of claim 4 wherein said liquid crystal is a mixture of nematic and cholesteric liquid crystal materials and is operable in the emulsion storage scattering mode.
Claim 5
Dependent Claim
18 words
The device of claim 1 wherein said layer of high electrical impedance is a layer of zinc sulfide.
Claim 6
Dependent Claim
22 words
The device of claim 6 wherein said layer of high electrical impedance has an impedance in excess of 1012 ohms per square.
Claim 7
Dependent Claim
25 words
The device of claim 1 wherein said layer of high electrical impedance has a higher electrical impedance than the dark impedance of said photoconductor layer.
Claim 8
Dependent Claim
18 words
The device of claim 8 wherein said layer of high electrical impedance is a layer of zinc sulfide.
Claim 9
Dependent Claim
52 words
The device of claim 1 wherein said layer of high electrical impedance has an impedance greater than 1015 ohms per square, said layer of liquid crystal has a dark impedance greater than 1012 ohms per square, and said layer of photoconductive material has a dark impedance greater than 1012 ohms per square.
Claim 10
Dependent Claim
18 words
The device of claim 10 wherein said layer of high electrical impedance is a layer of zinc sulfide.
Claim 11
Dependent Claim
15 words
The device of claim 10 wherein said photoconductor layer is a layer of cadmium sulfide.
Claim 12
Dependent Claim
18 words
The device of claim 12 wherein said layer of high electrical impedance is a layer of zinc sulfide.
Claim 13
Dependent Claim
45 words
The device of claim 13 wherein said electrically-conductive layers are cover plates, one of which is substantially transparent to light of a wavelength to which said photoconductor layer is sensitive so that said cover plates, said electrically-conductive layers, and the layers therebetween form said cell.
Claim 14
Dependent Claim
25 words
The device of claim 14 further includes means connected to said first and second electrically-conductive layers for applying an electric field between said electrically-conductive layers.
Claim 15
Dependent Claim
14 words
The device of claim 15 wherein said means is a source of direct current.
Claim 16
Dependent Claim
14 words
The device of claim 15 wherein said means is a source of alternating current.
Claim 17
Dependent Claim
16 words
The device of claim 15 wherein said means includes sources of both direct and alternating current.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |