US5650872A
Expired / Lapsed
US
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Light valve containing ultrafine particles
Assignee: Research Frontiers Inc
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Filing: 1995-01-13
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Granted: 1997-07-22
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Expires: 2015-01-13
Abstract
Abstract An electro-optical device, such as a light valve, has a cell formed of opposed cell walls, a light-modulating unit comprising a suspension containing anisometric particles suspended in a liquid suspending medium between the cell walls, and opposed electrodes operatively associated with the cell walls for applying an electrical field across the suspension, the anisometrically shaped particles having an average particle size of about 0.1 microns or less.
Inventors
- 👤 Robert L. Saxe
- 👤 Robert I. Thompson
- 👤 Matthew Forlini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:37
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10036; B32B17/10165; B32B17/10174; B32B17/10321; G; G02; G02F; G02F1/00; G02F1/01; G02F1/165; G02F1/166; G02F1/167; G02F1/17; G02F1/172; G02F2202/00; G02F2202/02; G02F2202/022
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
An electro-optical device, comprising a cell formed of opposed cell walls, a light-modulating unit comprising a suspension containing anisometric particles suspended in a liquid suspending medium between said cell walls, and opposed electrode means operatively associated with said cell walls for applying an electrical field across said suspension, said anisometric particles having an average dimension of about 0.001 to 0.2 microns and having been prepared by the Evaporative Dispersion Process.
Claim 2
Dependent Claim
70 words
An electro-optical device, comprising a cell formed of opposed cell walls, a light-modulating unit comprising a suspension containing anisometric particles suspended in a liquid suspending medium between said cell walls, and opposed electrode means operatively associated with said cell walls for applying an electrical field across said suspension, said anisometric particles having an average dimension of about 0.001 to 0.2 microns and having been prepared by the Evaporative Dispersion Process.
Claim 3
Dependent Claim
22 words
The device according to claim 1, wherein said electro-optical device is a light valve and said suspension is a light valve suspension.
Claim 4
Dependent Claim
20 words
The device according to claim 2, wherein said particles have an average particle size of about 0.1 microns or less.
Claim 5
Dependent Claim
18 words
The device according to claim 2 wherein said light valve suspension is a liquid suspension or a film.
Claim 6
Dependent Claim
14 words
The device according to claim 2, exhibiting no significant amount of visible light scatter.
Claim 7
Dependent Claim
18 words
The device according to claim 5, wherein said light valve suspension absorbs near infrared and/or far infrared radiation.
Claim 8
Dependent Claim
17 words
The device of claim 5, wherein said light valve suspension reflects near infrared and/or far infrared radiation.
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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) | 2000-07-21 | 2001-01-20 | 2001-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-07-21 | 2005-01-20 | 2005-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-07-21 | 2009-01-20 | 2009-07-22 | $7700.00 | Window Closed / Lapsed |