US4579422A
Expired / Lapsed
US
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Liquid crystal device for continuous rotation of selective polarization of monochromatic light
Assignee: Consiglio Nazionale delle Richerche
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Filing: 1983-07-12
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Granted: 1986-04-01
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Expires: 2003-07-12
Abstract
Abstract A liquid crystal device for continuous rotation of the selective polarization of monochromatic light is provided by a cholesteric mixture with positive dielectric anisotrophy contained between a pair of glass plates which are conductive on the surface in contact with the mixture and have received a surface treatment to provide planar orientation for the mixture. A voltage is applied between the two glass plates and an input light polarizer is applied to one of the two glass plates. The device preferably uses a cholesteric mixture comprising cholesteryl chloride (31.2%), cholesteryl oleyl carbonate (47.7%) and cholesteryl nonanoate (21.1%) and is advantageously employed in laboratory polarization rotators and colored display units.
Inventors
- 👤 Francesco Simoni
- 👤 Roberto Bartolino
- 👤 Nicola Guarracino
- 👤 Nicola Scaramuzza
- 👤 Giovanni Barbero
- 👤 Armando Catalano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:07
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13718; C; C09; C09K; C09K19/00; C09K19/04; C09K19/36
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
98 words
A liquid crystal device for the continuous rotation of the selective polarization of monochromatic light, comprising: a cholesteric mixture with positive dielectric anisotropy; first and second glass plates having facing conductive surfaces containing said cholesteric mixture therebetween; said facing conductive surfaces treated to impart planar orientation to said cholesteric mixture; a voltage applied between said glass plates; and an input light polarizer adjacent to said first glass plates, wherein said cholesteric mixture has the following composition (by weight) within the indicated range: Cholesteryl chloride: 31.0 to 31.5% Cholesteryl oleyl carbonate: 47.3 to 48.0% Cholesteryl nonanoate: 20.5 to 21.7%.
Claim 2
Dependent Claim
98 words
A liquid crystal device for the continuous rotation of the selective polarization of monochromatic light, comprising: a cholesteric mixture with positive dielectric anisotropy; first and second glass plates having facing conductive surfaces containing said cholesteric mixture therebetween; said facing conductive surfaces treated to impart planar orientation to said cholesteric mixture; a voltage applied between said glass plates; and an input light polarizer adjacent to said first glass plates, wherein said cholesteric mixture has the following composition (by weight) within the indicated range: Cholesteryl chloride: 31.0 to 31.5% Cholesteryl oleyl carbonate: 47.3 to 48.0% Cholesteryl nonanoate: 20.5 to 21.7%.
Claim 3
Dependent Claim
18 words
A device as defined in claim 1, wherein said conductive surfaces of said glass plates are indium depositions.
Claim 4
Dependent Claim
19 words
A device as defined in claim 1, wherein said conductive surfaces of said glass plates are tin dioxide depositions.
Claim 5
Dependent Claim
19 words
A device as defined in claim 1, wherein said conductive surfaces treatment is an oblique evaporation of silicon oxide.
Claim 6
Dependent Claim
19 words
A device as defined in claim 1, wherein said conductive surfaces treatment is a deposition of a silane solution.
Claim 7
Dependent Claim
88 words
A liquid crystal device for the continuous rotation of the selective polarization of monochromatic light, comprising: a cholesteric mixture with positive dielectric anisotropy; first and second glass plates having facing conductive surfaces containing said cholesteric mixture therebetween; said facing conductive surfaces treated to impart planar orientation to said cholesteric mixture; a voltage applied between said glass plates; and an input light polarizer adjacet to said first glass plates, wherein said cholesteric mixture has the following composition (by weight): Cholesteryl chloride: 31.2% Cholesteryl oleyl carbonate: 47.7% Cholesteryl nonanoate: 21.1%.
Claim 8
Dependent Claim
88 words
A liquid crystal device for the continuous rotation of the selective polarization of monochromatic light, comprising: a cholesteric mixture with positive dielectric anisotropy; first and second glass plates having facing conductive surfaces containing said cholesteric mixture therebetween; said facing conductive surfaces treated to impart planar orientation to said cholesteric mixture; a voltage applied between said glass plates; and an input light polarizer adjacet to said first glass plates, wherein said cholesteric mixture has the following composition (by weight): Cholesteryl chloride: 31.2% Cholesteryl oleyl carbonate: 47.7% Cholesteryl nonanoate: 21.1%.
Claim 9
Dependent Claim
87 words
A coloured display unit, comprising: a cholesteric mixture with positive dielectric anisotropy; first and second glass plates having facing conductive surfaces containing said cholesteric mixture therebetween; said facing conductive surfaces treated to impart planar orientation to said cholesteric mixture; a voltage applied between said glass plates; and an input light polarizer adjacent to said first glass plates, wherein said cholesteric mixture has the following composition (by weight) within the indicated range: Cholesteryl chloride: 31.0 to 31.5% Cholesteryl oleyl carbonate: 47.3 to 48.0% Cholesteryl nonanoate: 20.5 to 21.7%.
Claim 10
Dependent Claim
87 words
A coloured display unit, comprising: a cholesteric mixture with positive dielectric anisotropy; first and second glass plates having facing conductive surfaces containing said cholesteric mixture therebetween; said facing conductive surfaces treated to impart planar orientation to said cholesteric mixture; a voltage applied between said glass plates; and an input light polarizer adjacent to said first glass plates, wherein said cholesteric mixture has the following composition (by weight) within the indicated range: Cholesteryl chloride: 31.0 to 31.5% Cholesteryl oleyl carbonate: 47.3 to 48.0% Cholesteryl nonanoate: 20.5 to 21.7%.
Claim 11
Dependent Claim
16 words
A coloured display unit as defined in claim 7, and spacers disposed between said glass plates.
Claim 12
Dependent Claim
20 words
A coloured device unit as defined in claim 7, wherein said conductive surfaces of said glass plates are indium depositions.
Claim 13
Dependent Claim
21 words
A coloured device unit as defined in claim 7, wherein said conductive surfaces of said glass plates are tin dioxide depositions.
Claim 14
Dependent Claim
21 words
A coloured device unit as defined in claim 7, wherein said conductive surfaces treatment is an oblique evaporation of silicon oxide.
Claim 15
Dependent Claim
21 words
A coloured device unit as defined in claim 7, wherein said conductive surfaces treatment is a deposition of a silane solution.
Claim 16
Dependent Claim
20 words
A coloured display unit as defined in claim 7, and an output light polarizer adjacent to said second glass plate.
Claim 17
Dependent Claim
35 words
A coloured display unit as defined in claim 7, and means for causing said second glass plate to be reflective toward said first glass plate; and an output polarizer adjacent to said second glass plate.
Claim 18
Dependent Claim
77 words
A coloured display unit, comprising: a cholesteric mixture with positive dielectric anisotropy; first and second glass plates having facing conductive surfaces containing said cholesteric mixture therebetween; said facing conductive surfaces treated to impart planar orientation to said cholesteric mixture; a voltage applied between said glass plates; and an input light polarizer adjacent to said first glass plates, wherein said cholesteric mixture has the following composition (by weight): Cholesteryl chloride: 31.2% Cholesteryl oleyl carbonate: 47.7% Cholesteryl nonanoate: 21.1%.
Claim 19
Dependent Claim
77 words
A coloured display unit, comprising: a cholesteric mixture with positive dielectric anisotropy; first and second glass plates having facing conductive surfaces containing said cholesteric mixture therebetween; said facing conductive surfaces treated to impart planar orientation to said cholesteric mixture; a voltage applied between said glass plates; and an input light polarizer adjacent to said first glass plates, wherein said cholesteric mixture has the following composition (by weight): Cholesteryl chloride: 31.2% Cholesteryl oleyl carbonate: 47.7% Cholesteryl nonanoate: 21.1%.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |