Patent US2048916A successfully refreshed from Google Patents.
Patent US2755255A successfully refreshed from Google Patents.
US2755255A
Expired / Lapsed
US
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Electroluminescent zinc sulfide phosphor
Assignee: General Electric Co
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Filing: 1953-01-30
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Granted: 1956-07-17
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Expires: 1973-01-30
Abstract
No abstract record available.
Inventors
- 👤 Beutler Carolee Crawford
- 👤 Jerome S Prener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:11
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
77 words
THE METHOD OF PREPARING A COPPER-ACTIVATED ZINC SULFIDE PHOSPHOR HAVING A GREEN ELECTROLUMINESCENT EMISSION WHICH COMPRISES FIRING A MIXTURE CONSISTING OF ZINC SULFIDE, SUFFICIENT COPPER SALT TO PROVIDE ABOUT 0.3% BY WEIGHT OF COPPER AND AT LEAST 5% BY WEIGHT OF A FLUX SELECTED FROM THE GROUP CONSISTING OF ALKALI CHLORIDE AND ALKALI BROMIDE AT A TEMPERATURE OF APPROXIMATELY 1100* C. IN AN INERT ATMOSPHERE, AND REMOVING EXCESS COPPER BY WASHING THE PHOSPHOR IN A CYANIDE SOLUTION.
References Cited (Backward Citations)
US2541384A
Cited
US2660566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |