US2951813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing an electroluminescent zinc sulfide phosphor
Assignee: Westinghouse Electric Corp
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Filing: 1956-12-24
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Granted: 1960-09-06
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Expires: 1976-12-24
Abstract
No abstract record available.
Inventors
- 👤 Wachtel Anselm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:12
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
95 words
THE METHOD OF PREPARING AN ELECTROLUMINESCENT ZINC SULFIDE PHOSPHOR ACTIVATED BY COPPER AND COACTIVATED BY CHLORINE, COMPRISING ADMIXING ZINC SULFIDE AND COPPERCONTAINING COMPOUND, SAID ADMIXTURE CONTAINING FROM 0.004 TO 0.012 GRAM-ATOM OF COPPER IN COMPOUND FORM PER MOLE OF ZINC SULFIDE, PLACING SAID ADMIXTURE INTO A FIRING CONTAINER, FIRING SAID ADMIXTURE AT A TEMPERATURE OF FROM 850*C. TO 1000*C. FOR AT LEAST ONE HOUR WHILE INTRODUCING INTO SAID FIRING CONTAINER AN ATMOSPHERE COMPRISING INSERT GAS HAVING SULPHUR MONOCHLORIDE VAPOR ADMIXED THEREWITH, AND COOLING SAID FIRED ADMIXTURE IN AN ATMOSPHERE WHICH IS SUBSTANTIALLY FREE FROM OXYGEN.
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) | 1963-09-06 | 1964-03-07 | 1964-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-06 | 1968-03-07 | 1968-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-06 | 1972-03-07 | 1972-09-06 | $7700.00 | Window Closed / Lapsed |