US4422963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light valve polarizing materials and suspensions thereof
Assignee: Research Frontiers Inc
•
Filing: 1978-11-15
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Granted: 1983-12-27
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Expires: 1998-11-15
Abstract
Abstract A light-polarizing perhalide of an alkaloid acid salt having incorporated in its molecular structure a chloride, bromide, or iodide of calcium, rubidium, cesium or bismuth, and a light valve containing a suspension of particles of such perhalide.
Inventors
- 👤 Robert I. Thompson
- 👤 Robert L. Saxe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:57
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/17; G02F1/172
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
58 words
A light polarizing perhalide of an alkaloid acid salt having incorporated in its molecular structure at least one halide of the formula MX.sub.n wherein M is rubidium or cesium, X is chlorine, bromine or iodine and n is the valence of M, said perhalide being the reaction product of an alkaloid acid salt, elemental iodine and said halide.
Claim 2
Dependent Claim
58 words
A light polarizing perhalide of an alkaloid acid salt having incorporated in its molecular structure at least one halide of the formula MX.sub.n wherein M is rubidium or cesium, X is chlorine, bromine or iodine and n is the valence of M, said perhalide being the reaction product of an alkaloid acid salt, elemental iodine and said halide.
Claim 3
Dependent Claim
121 words
In a light valve, comprising a cell having opposed walls and containing a suspension of light polarizing particles in a liquid suspending medium, said suspension being operable to transmit more light through said suspension when an electric or magnetic field is applied across said cell walls than when said field is not applied, the improvement wherein said light polarizing particles are colloidal particles of a light-polarizing perhalide of an alkaloid acid salt having incorporated in its molecular structure at least one halide of the formula MX.sub.n wherein M is rubidium or cesium, X is chlorine, bromine or iodine and n is the valence of M, said perhalide being the reaction product of an alkaloid acid salt, elemental iodine and said halide.
Claim 4
Dependent Claim
121 words
In a light valve, comprising a cell having opposed walls and containing a suspension of light polarizing particles in a liquid suspending medium, said suspension being operable to transmit more light through said suspension when an electric or magnetic field is applied across said cell walls than when said field is not applied, the improvement wherein said light polarizing particles are colloidal particles of a light-polarizing perhalide of an alkaloid acid salt having incorporated in its molecular structure at least one halide of the formula MX.sub.n wherein M is rubidium or cesium, X is chlorine, bromine or iodine and n is the valence of M, said perhalide being the reaction product of an alkaloid acid salt, elemental iodine and said halide.
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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) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |