US3700306A
Expired / Lapsed
US
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Electro-optic shutter having a thin glass or silicon oxide layer between the electrodes and the liquid crystal
Assignee: NCR Voyix Corp
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Filing: 1971-09-22
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Granted: 1972-10-24
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Expires: 1991-09-22
Abstract
Abstract An electro-optic shutter employing nematic liquid crystal material is disclosed. The electrodes of the shutter of this invention are protected with a thin overcoat of an insulating material such as glass. This thin overcoat essentially prevents rapid electrode failure due to conduction of current through the liquid crystal material.
Inventors
- 👤 James V Cartmell
- 👤 Donald Churchill
- 👤 Donald E Koopman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:58
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/13378; G02F1/133784; G02F1/133345; G02F1/1335; G02F1/133553
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
19 words
A shutter according to claim 1 wherein the thin overcoat has a thickness ranging from 0.1 to 1.0 micron.
Claim 2
Dependent Claim
18 words
A shutter according to claim 1 wherein the two spaced transparent plates are sandwiched between two linear polarizers.
Claim 3
Dependent Claim
18 words
A shutter according to claim 3 wherein the polarizers and film are oriented in parallel and perpendicular directions.
Claim 4
Dependent Claim
18 words
A shutter according to claim 1 wherein the nematic liquid crystal is characterized by a positive dielectric anisotropy.
Claim 5
Dependent Claim
13 words
A shutter according to claim 1 wherein the nematic liquid crystal is p-n-alkoxybenzilidene-p-aminobenzonitrile.
Claim 6
Dependent Claim
28 words
A shutter according to claim 1 wherein the nematic liquid crystal material is a mixture by weight of 40 percent methoxybenzilidene-n-butylaniline, 40 percent ethoxybenzilidene-n-butylaniline and 20 percent p-n-butoxybenzilidene-p''-aminobenzonitrile.
Claim 7
Dependent Claim
14 words
A shutter according to claim 1 wherein the electrically conductive film is indium oxide.
Claim 8
Dependent Claim
19 words
A shutter according to claim 1 wherein the voltage gradient is pulsed, unipolar D.C., bipolar D.C. or A.C. potential.
Claim 9
Dependent Claim
21 words
A shutter according to claim 1 wherein the voltage gradient is 4 volts for 250 pulses per second unipolar D.C. potential.
Claim 10
Dependent Claim
14 words
A shutter according to claim 1 wherein the two spaced transparent plates are glass.
Claim 11
Dependent Claim
28 words
A shutter according to claim 1 wherein the nematic liquid crystal material is a mixture by weight of 32 percent methoxybenzilidene-n-butylaniline, 58 percent ethoxybenilidene-n-butylaniline and 10 percent p-n-butoxy-benzilidene-p''-aminobenzonitrile.
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |