US3052810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-luminescent lamps
Assignee: EMI Group Ltd
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Filing: 1958-02-18
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Granted: 1962-09-04
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Expires: 1978-02-18
Abstract
No abstract record available.
Inventors
- 👤 Mash Derek Hubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:49
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/22; H05B33/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
AN ELECTROLUMINESCENT LAMP COMPRISING, IN THE ORDER NAMED, A TRANSPARENT ELECTRODE, A LIGHT-PRODUCING LAYER, A REFLECTING LAYER AND A SECOND ELECTRODE, SAID REFLECTING LAYER COMPRISING A FLUORESCENT MATERIAL ABSORBING AT LEAST PART OF THE LIGHT EMITTED BY SAID PHOSPHOR AND BEING EXCITED BY THE ABSROBED LIGHT TO EMIT LIGHT AT A WAVELENGTH LONGER THAN THAT OF THE ABSORBED LIGHT.
Claim 2
Dependent Claim
59 words
AN ELECTROLUMINESCENT LAMP COMPRISING, IN THE ORDER NAMED, A TRANSPARENT ELECTRODE, A LIGHT-PRODUCING LAYER, A REFLECTING LAYER AND A SECOND ELECTRODE, SAID REFLECTING LAYER COMPRISING A FLUORESCENT MATERIAL ABSORBING AT LEAST PART OF THE LIGHT EMITTED BY SAID PHOSPHOR AND BEING EXCITED BY THE ABSROBED LIGHT TO EMIT LIGHT AT A WAVELENGTH LONGER THAN THAT OF THE ABSORBED LIGHT.
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) | 1965-09-03 | 1966-03-05 | 1966-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-03 | 1970-03-05 | 1970-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-03 | 1974-03-05 | 1974-09-04 | $7700.00 | Window Closed / Lapsed |