Patent US2774902A successfully refreshed from Google Patents.
US2774902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent lamp
Assignee: GTE Sylvania Inc
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Filing: 1953-08-18
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Granted: 1956-12-18
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Expires: 1973-08-18
Abstract
No abstract record available.
Inventors
- 👤 Burns Laurence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:47
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
AN ELECTROLUMINESCENT LAMP COMPRISING TWO ELECTRODES AND A LAYER THEREBETWEEN OF A COPPER-ACTIVATED ZINC SULFIDE ELECTROLUMINESCENT PHOSPHOR CONTAINING FROM ABOUT 10-4 TO ABOUT 10-5 PERCENT BY WEIGHT OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF NICKEL, COBALT AND IRON, THE COPPER ACTIVATOR BEING PRESENT IN AMOUNT BETWEEN 0.0002 AND 0.0015 GRAM ATOMS PER MOLE OF ZINC SULFIDE.
Claim 2
Dependent Claim
58 words
AN ELECTROLUMINESCENT LAMP COMPRISING TWO ELECTRODES AND A LAYER THEREBETWEEN OF A COPPER-ACTIVATED ZINC SULFIDE ELECTROLUMINESCENT PHOSPHOR CONTAINING FROM ABOUT 10-4 TO ABOUT 10-5 PERCENT BY WEIGHT OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF NICKEL, COBALT AND IRON, THE COPPER ACTIVATOR BEING PRESENT IN AMOUNT BETWEEN 0.0002 AND 0.0015 GRAM ATOMS PER MOLE OF ZINC SULFIDE.
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) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |