Patent US3000834A successfully refreshed from Google Patents.
US3000834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing a green electroluminescent zinc sulphide phosphor
Assignee: General Electric Co
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Filing: 1958-04-18
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Granted: 1961-09-19
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Expires: 1978-04-18
Abstract
No abstract record available.
Inventors
- 👤 Aven Manuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:53
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
THE METHOD OF PREPARING A GREEN ELECTROLUMINESCENT PHOSPHOR HAVING A LARGE PARTICLE SIZE FOR IMPROVED RESISTANCE TO WATER DEPRECIATION WHICH COMPRISES PREFIRING AT A TEMPERATURE IN THE RANGE OF 1150 TO 1250*C. A MIXTURE OF ZNS AND 10 TO 40% ZNO BY WEIGHT, COOLING THE PREFIRED MATERIAL AND ADDING COPPER AND CHLORIDE SALTS TO PROVIDE 0.1 TO 0.75 MOLE PERCENT AND 1 TO 3 MOLE PERCENT RESPECTIVELY, AND REFIRING AT A TEMPERATURE IN THE RANGE OF 850-950*C. FOR A LENGTH OF TIME SUFFICIENT TO ASSURE SUBSTANTIAL FRANSFORMATION FROM THE HEXAGONAL TO THE CUBIC PHASE IN THE REFIRED MATERIAL.
Claim 2
Independent Claim
98 words
THE METHOD OF PREPARING A GREEN ELECTROLUMINESCENT PHOSPHOR HAVING A LARGE PARTICLE SIZE FOR IMPROVED RESISTANCE TO WATER DEPRECIATION WHICH COMPRISES PREFIRING AT A TEMPERATURE IN THE RANGE OF 1150 TO 1250*C. A MIXTURE OF ZNS AND 10 TO 40% ZNO BY WEIGHT, COOLING THE PREFIRED MATERIAL AND ADDING COPPER AND CHLORIDE SALTS TO PROVIDE 0.1 TO 0.75 MOLE PERCENT AND 1 TO 3 MOLE PERCENT RESPECTIVELY, AND REFIRING AT A TEMPERATURE IN THE RANGE OF 850-950*C. FOR A LENGTH OF TIME SUFFICIENT TO ASSURE SUBSTANTIAL FRANSFORMATION FROM THE HEXAGONAL TO THE CUBIC PHASE IN THE REFIRED MATERIAL.
References Cited (Backward Citations)
BE526180A
Cited
US2821509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |