Patent FR2419077A1 successfully refreshed from Google Patents.
US3803408A
Expired / Lapsed
US
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Image converter
Assignee: Thales SA
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Filing: 1973-01-15
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Granted: 1974-04-09
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Expires: 1993-01-15
Abstract
Abstract An image converter comprising, between two transparent electrodes connected to a d.c. supply source, a layer of nematic liquid crystal and a layer of photoconductive material located against each other. An image to be converted is projected onto the photoconductive layer and the liquid crystal layer is illuminated by an auxiliary light source.
Inventors
- 👤 G Assouline
- 👤 E Leiba
- 👤 E Spitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:59
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/135
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
34 words
An image converter as claimed in claim 1, wherein said optical means comprise an auxiliary source located for illuminating said liquid crystal layer from the side at which said liquid crystal layer is observed.
Claim 2
Dependent Claim
35 words
An image converter as claimed in claim 2, wherein a thin screen layer, electrically conductive and opaque to the radiations supplied by said auxiliary source is placed between said photo-conductive and said liquid crystal layers.
Claim 3
Dependent Claim
18 words
An image converter as claimed in claim 3, wherein said screen layer is a layer of carbon black.
Claim 4
Dependent Claim
51 words
An image converter as claimed in claim 1, wherein said optical means comprise an auxiliary source located for illuminating said liquid crystal layer through said photo-conductive layer, said photo-conductive layer and the radiations supplied by said auxiliary source being so selected that said photo-conductive layer does not substantially absorb said radiations.
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) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |