Patent US2443867A successfully refreshed from Google Patents.
Patent US3143682A successfully refreshed from Google Patents.
US3143682A
Expired / Lapsed
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Electroluminescent devices with a barium titanate layer
Assignee: British Thomson Houston Co Ltd
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Filing: 1954-12-20
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Granted: 1964-08-04
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Expires: 1974-12-20
Abstract
No abstract record available.
Inventors
- 👤 Maurice G Clarke
- 👤 Cyril H Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:36
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/22; H05B33/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
AN ELECTROLUMINESCENT DEVICE COMPRISING AN ELECTRICALLY CONDUCTIVE LIGHT-TRANSMITTING PLATE, A LAYER THEREOVER OF ELECTROLUMINESCENT PHOSPHOR, DENSELY DISPERSED IN AN INSULTING RESIN, A LAYER THEREOVER OF A MATERIAL OF HIGH DIELECTRIC CONSTANT AND HIGH LIGHT REFLECTANCE AND COMPRISING BARIUM TITANTE DENSELY DISSPERSED IN AN INSULATING RESIN AND SERVING TO REFLECT LIGHT FROM SAID PHOSPHOR LAYER TOWARD SAID LIGHT-TRANSMITTING PLATE, AND A COATING THEREOVER OF ELECTRICALLY CONDUCTIVE MATERIAL.
Claim 2
Dependent Claim
66 words
AN ELECTROLUMINESCENT DEVICE COMPRISING AN ELECTRICALLY CONDUCTIVE LIGHT-TRANSMITTING PLATE, A LAYER THEREOVER OF ELECTROLUMINESCENT PHOSPHOR, DENSELY DISPERSED IN AN INSULTING RESIN, A LAYER THEREOVER OF A MATERIAL OF HIGH DIELECTRIC CONSTANT AND HIGH LIGHT REFLECTANCE AND COMPRISING BARIUM TITANTE DENSELY DISSPERSED IN AN INSULATING RESIN AND SERVING TO REFLECT LIGHT FROM SAID PHOSPHOR LAYER TOWARD SAID LIGHT-TRANSMITTING PLATE, AND A COATING THEREOVER OF ELECTRICALLY CONDUCTIVE MATERIAL.
References Cited (Backward Citations)
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Cited
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US2436208A
Cited
US2519722A
Cited
US2582931A
Cited
US2566349A
Cited
US2873380A
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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) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |