US3749474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oriented light scattering display device
Assignee: NCR Voyix Corp
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Filing: 1971-11-26
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Granted: 1973-07-31
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Expires: 1991-11-26
Abstract
Abstract An electro-optical, light scattering display device which employs nematic liquid crystal material is disclosed. The faces of the device bearing the conductive electrodes are unidirectionally oriented by rubbing. The liquid crystals align with their molecular axes parallel to the surface of the faces and along the rubbing direction with the field off. When the field is on, dynamic light scattering occurs in the electrode area. Due to this rubbing alignment, a rapid response between the on-off states is evident.
Inventors
- 👤 J Cartmell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:39
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13743; G02F1/1375; G02F1/139; G02F1/1396
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
19 words
A device according to claim 1 wherein the two spaced transparent plates are sandwiched between two uncrossed linear polarizers.
Claim 2
Dependent Claim
13 words
A device according to claim 1 wherein the nematic liquid crystal is p-n-alkoxybenzilidene-p-aminobenzoalkyl.
Claim 3
Dependent Claim
24 words
A device according to claim 1 wherein the nematic liquid crystal material is a 1 mole to 1 mole mixture of methoxybenzilidene-n-butylaniline and ethoxybenzilidene-n-butylaniline.
Claim 4
Dependent Claim
14 words
A device according to claim 1 wherein the nematic liquid crystal material is methoxybenzilidene-n-butylaniline.
Claim 5
Dependent Claim
14 words
A device according to claim 1 wherein the electrically conductive film is indium oxide.
Claim 6
Dependent Claim
24 words
A device according to claim 1 wherein the voltage gradient is A.C. potential or bipolar D.C. potential at 20 to 200 cycles per second.
Claim 7
Dependent Claim
22 words
A device according to claim 1 wherein the voltage gradient is A.C. potential or bipolar D.C. potential at 60 cycles per second.
Claim 8
Dependent Claim
14 words
A device according to claim 1 wherein the two spaced transparent plates are glass.
References Cited (Backward Citations)
US3625591A
Cited
US3655270A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |