US4657349A
Expired / Lapsed
US
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Electro- and magneto-optic devices
Assignee: Temple University
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Filing: 1984-08-14
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Granted: 1987-04-14
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Expires: 2004-08-14
Abstract
Abstract An electro- and magneto-optic device which comprises a fluid suspension of anisotropic platelets in a dielectric media, and a means for imposing an electrical or magnetic field on the suspension. Orientation of such platelets in the media is accomplished by imposition of an electrical or magnetic field. The invention may be used to provide an information display or a field controlled shutter in window glass.
Inventors
- 👤 Mortimer M. Labes
- 👤 Beverly D. Bostwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:21
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/17; G02F1/172
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
67 words
An electro- or magneto-optic device comprising (a) a fluid suspension of anisotropic platelets in a dielectric medium, said platelets being mobile within said medium, and (b) means for subjecting said suspension to the influence of an electrical or magnetic field, said anisotropic platelets comprising a material having a density equal to or greater than that of nafoxidine hydrochloride and less than or equal to that of guanine.
Claim 2
Dependent Claim
67 words
An electro- or magneto-optic device comprising (a) a fluid suspension of anisotropic platelets in a dielectric medium, said platelets being mobile within said medium, and (b) means for subjecting said suspension to the influence of an electrical or magnetic field, said anisotropic platelets comprising a material having a density equal to or greater than that of nafoxidine hydrochloride and less than or equal to that of guanine.
Claim 3
Dependent Claim
16 words
A device, as recited in claim 1, wherein said suspension is retained between spaced parallel plates.
Claim 4
Dependent Claim
12 words
A device, as recited in claim 2, wherein said plates are transparent.
Claim 5
Dependent Claim
39 words
A device, as recited in claim 3, wherein said field subjecting means comprises electrodes associated with said plates, said electrodes being connected to an electrical potential, wherein at least a portion of said suspension is disposed between said electrodes.
Claim 6
Dependent Claim
16 words
A device, as recited in claim 4, wherein said electrodes comprise a transparent or semitransparent material.
Claim 7
Dependent Claim
31 words
A device, as recited in claim 2, wherein said spaced parallel plates are spaced from one another a distance of 1-100 times the average of the maximum dimension of said platelets.
Claim 8
Dependent Claim
31 words
A device, as recited in claim 2, wherein said spaced parallel plates are spaced from one another a distance of 1-10 times the average of the maximum dimension of said platelets.
Claim 9
Dependent Claim
28 words
A device, as recited in claim 1, wherein said field subjecting means comprises magnetic poles, at least a portion of said suspension being disposed between said magnetic poler.
Claim 10
Dependent Claim
18 words
A device, as recited in claim 1, wherein said platelets are 2.5-5 μm thick and 18-25 μm wide.
Claim 11
Dependent Claim
20 words
A device, as recited in claim 9, wherein said plates are spaced from 19 to 254 μm from one another.
Claim 12
Dependent Claim
28 words
A device, as recited in claim 10, wherein said field subjecting means electrodes are connected to an alternating current source with a frequency of at least 1 kHz.
Claim 13
Dependent Claim
13 words
A device, as recited in claim 1, wherein said platelets comprise nafoxidine hydrochloride.
Claim 14
Dependent Claim
13 words
A device, as recited in claim 12, wherein said dielectric medium comprises glycerol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |