US3905682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal devices of improved contrast
Assignee: RCA Corp
•
Filing: 1974-06-14
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Granted: 1975-09-16
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Expires: 1994-06-14
Abstract
Abstract Disposed behind a liquid crystal cell comprising transparent substrates and electrodes is a retro-reflecting surface for reflecting light incident onto the cell in directions substantially towards the sources of the light and generally away from a viewer of the cell.
Inventors
- 👤 Dietrich Meyerhofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:33
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133553
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
48 words
In combination, a liquid crystal device inCluding: a body of liquid crystal material, said device being designed to be viewed along directions intersecting a front surface of said body, and a retro-reflecting member disposed, with respect to said viewing directions, behind said body and intersected by said directions.
Claim 2
Dependent Claim
48 words
In combination, a liquid crystal device inCluding: a body of liquid crystal material, said device being designed to be viewed along directions intersecting a front surface of said body, and a retro-reflecting member disposed, with respect to said viewing directions, behind said body and intersected by said directions.
Claim 3
Dependent Claim
21 words
The combination of claim 1 in which said retro-reflecting member comprises a layer of transparent spheres mounted on a specular surface.
Claim 4
Dependent Claim
41 words
The combination of claim 1 in which said device comprises: a pair of oppositely disposed front and rear transparent substrates, said body of liquid crystal material being disposed between said substrates; and said retro-reflecting member is disposed behind said rear substrate.
References Cited (Backward Citations)
US3728007A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |