Patent US3747075A successfully refreshed from Google Patents.
US3747075A
Expired / Lapsed
US
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Electro-optical storage device
Assignee: RCA Corp
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Filing: 1970-04-03
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Granted: 1973-07-17
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Expires: 1990-04-03
Abstract
Abstract An electro-optical material body has two opposed surfaces, each covered with a transparent photoconductive material layer covered, in turn, with a transparent conductive electrode. Although not necessary, in a preferred method of operation, information is written into the body using light which is directed onto the body surfaces at an angle of inclination which is the same as that used with the light used to read information from the device. In a different embodiment, one surface of the body is covered by a transparent photoconductive material layer covered, in turn, by a transparent electrode, while the other surface of the body has a plurality of spaced electrodes thereon.
Inventors
- 👤 S Keneman
- 👤 G Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:39
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/21; G11C11/22; G11C13/00; G11C13/04; G11C13/047
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
An optical storage device comprising: an electro-optical body having a pair of surfaces related to the crystallographical orientation of said body such that domains within said body are polarizable between two states in response to the application of an electric field through said body via said surfaces, means, responsive to the directing of a beam of light through said body and through both said surfaces, for providing an elemental electrode at each of said surfaces, the positions of said electrodes at each of said surfaces being determined independently of one another by the surface intercepts of said beam, said elemental electrodes being the sole means whereby an electric field can be applied through said body and wherein each of said surfaces has a light transmitting photoconductive material layer thereon, and each of said photoconductive layers has a transparent electrically conductive layer on the outer surface thereof.
Claim 2
Dependent Claim
68 words
An optical storage device comprising: a flat member of an electro-optical material, a light transmitting photoconductive layeR on each of the major surfaces thereof, a conductive layer on each of said photoconductive layers, at least one of said conductive layers being transparent, and means for directing light onto said member through said transparent conductive layer for writing information into said device and for detecting the information written therein.
Claim 3
Dependent Claim
43 words
An optical storage device comprising: a flat member of an electro-optical material, a light transmitting photoconductive layer on each of the major surfaces thereof, and a conductive layer on each of said photoconductive layers, at least one of said conductive layers being transparent.
Claim 4
Dependent Claim
14 words
A device as in claim 4 wherein both of said conductive layers are transparent.
Claim 5
Dependent Claim
22 words
A device as in claim 4 wherein the surface facing said member of the other of said conductive layers is light reflecting.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |