US3702215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron beam controlled bistable ferroelectric light valve
Assignee: STEWART E CUMMINS
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Filing: 1971-03-08
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Granted: 1972-11-07
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Expires: 1991-03-08
Abstract
Abstract FERROELECTRIC DOMAINS IN A CRYSTAL OF FERROELECTRIC BISMUTH TITANATE (BI4TI3O12) ARE SWITCHED BETWEEN TWO STABLE STATES, BY A CONTROLLED ELECTRON BEAM. ONE STATE PROVIDES OPTICAL TRANSPARENCY AND THE OTHER OPTICAL OPACITY, IN A POLARIZED LIGHT SYSTEM. THE BISTABLES ACTION OF THE FERROELECTRIC DOMAINS IN THE CRYSTAL PROVIDES A MULTICELL MEMORY DEVICE WITH NONDESTRUCTIVE OPTICAL READ-OUT.
Inventors
- 👤 Stewart E Cummins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:26
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/05; G02F1/0525
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |