US4048358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal devices
Assignee: UK Secretary of State for Defence
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Filing: 1976-08-18
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Granted: 1977-09-13
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Expires: 1996-08-18
Abstract
Abstract A liquid crystal device includes a sheet of plastic material having an open pore structure in which a liquid crystal material has been introduced. The liquid crystal material may be dichroic and contain one or more dyes which may be dichroic. The liquid crystal material may be nematic or cholesteric or a mixture of these two or a smectic material. Protective layers of plastic or glass may be arranged to enclose the sheet and the protective layer may carry electrodes. The liquid crystal may be applied to selected portions only of the sheet and the remaining parts of the sheet filled with a non-mesomorphic material.
Inventors
- 👤 Ian Alexander Shanks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:33
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13725; G02F1/133; G02F1/1333; G02F1/1334; C; C09; C09K; C09K2323/00; C09K2323/03; C09K2323/031; C09K2323/033; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249994; Y10T428/249995
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
45 words
A liquid crystal polarizer device comprising a sheet of plastics material having an open elongated pore structure into which elongated pores a liquid crystal material has been introduced, the size of said pores being slightly larger than the molecular dimensions of said liquid crystal material.
Claim 2
Dependent Claim
45 words
A liquid crystal polarizer device comprising a sheet of plastics material having an open elongated pore structure into which elongated pores a liquid crystal material has been introduced, the size of said pores being slightly larger than the molecular dimensions of said liquid crystal material.
Claim 3
Dependent Claim
23 words
A liquid crystal device as claimed in claim 1 wherein the liquid crystal material has been applied to selected portions of the sheet.
Claim 4
Dependent Claim
26 words
A liquid crystal device as claimed in claim 2 wherein a non-mesomorphic material has been applied to the sheet in places not carrying liquid crystal material.
Claim 5
Dependent Claim
17 words
A liquid crystal device as claimed in claim 1 wherein the sheet is enclosed between protective layers.
Claim 6
Dependent Claim
15 words
A liquid crystal device as claimed in claim 4 wherein the protective layers are glass.
Claim 7
Dependent Claim
17 words
A liquid crystal device as claimed in claim 4 wherein the protective layers are transparent plastic material.
Claim 8
Dependent Claim
16 words
A liquid crystal device as claimed in claim 1 wherein the liquid crystal material is dichroic.
Claim 9
Dependent Claim
19 words
A liquid crystal device as claimed in claim 1 wherein the liquid crystal material contains at least one dye.
Claim 10
Dependent Claim
14 words
A liquid crystal device as claimed in claim 8 wherein a dye is dichroic.
Claim 11
Dependent Claim
18 words
A liquid crystal device as claimed in claim 1 wherein the liquid crystal material is a nematic material.
Claim 12
Dependent Claim
18 words
A liquid crystal device as claimed in claim 10 and further including a proportion of cholesteric liquid crystal.
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) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |