Patent US3218390A successfully refreshed from Google Patents.
US3218390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system for the utilization of coherent light
Assignee: Individual
•
Filing: 1961-12-27
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Granted: 1965-11-16
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Expires: 1981-12-27
Abstract
No abstract record available.
Inventors
- 👤 Bramley Jenny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:05
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/015; G02F1/03; G02F1/0333
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A LIGHT VALVE COMPRISING A CATHODE RAY TUBE HAVING AN ELECTRON GUN PRODUCING AN ELECTRON BEAM OF ENERGY OF AT LEAST 25 KILOVOLTS AND A CURRENT DENSITY OF AT LEAST 1 MILLIAMPERE/MM.2, A SEMICONDUCTOR SCREEN IN THE PATH OF THE SCANNING ELECTRON BEAM, THE ELECTRON BEAM GENERATING IN THE SCREEN AN INCREASED DENSITY OF CARRIERS IN THE CONDUCTION BAND, WHICH CHANGE THE OPTICAL PROPERTIES OF SAID SCREEN WITHIN LESS THAN 100 NANOSECONDS, AND SPATIALLY MODULATING THE OPTICAL PROPERTIES OF THE SCREEN, MEANS FOR INTRODUCING LIGHT INTO THE TUBE TO IMPINGE UPON THE SCREEN AND BE TIME-SEQUENTIALLY AND SPATIALLY MODULATED THEREBY, AND MEANS FOR ALLOWING THE TIME-SEQUENTIALLY AND SPATIALLY MODULATED LIGHT TO EMERGE FROM THE TUBE.
Claim 2
Dependent Claim
115 words
A LIGHT VALVE COMPRISING A CATHODE RAY TUBE HAVING AN ELECTRON GUN PRODUCING AN ELECTRON BEAM OF ENERGY OF AT LEAST 25 KILOVOLTS AND A CURRENT DENSITY OF AT LEAST 1 MILLIAMPERE/MM.2, A SEMICONDUCTOR SCREEN IN THE PATH OF THE SCANNING ELECTRON BEAM, THE ELECTRON BEAM GENERATING IN THE SCREEN AN INCREASED DENSITY OF CARRIERS IN THE CONDUCTION BAND, WHICH CHANGE THE OPTICAL PROPERTIES OF SAID SCREEN WITHIN LESS THAN 100 NANOSECONDS, AND SPATIALLY MODULATING THE OPTICAL PROPERTIES OF THE SCREEN, MEANS FOR INTRODUCING LIGHT INTO THE TUBE TO IMPINGE UPON THE SCREEN AND BE TIME-SEQUENTIALLY AND SPATIALLY MODULATED THEREBY, AND MEANS FOR ALLOWING THE TIME-SEQUENTIALLY AND SPATIALLY MODULATED LIGHT TO EMERGE FROM THE TUBE.
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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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |