US2987485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent phosphor
Assignee: General Electric Co
•
Filing: 1955-01-17
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Granted: 1961-06-06
•
Expires: 1975-01-17
Abstract
No abstract record available.
Inventors
- 👤 Herman C Froelich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:38
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A COPPER AND SILVER ACTIVATED ZINC SULFIDE-ZINC OXIDE, ELECTRO-LUMINESCENT FIELD RESPONSIVE, PHOSPHOR PRODUCED BY FIRING A MIXTURE OF FROM ABOUT 95% TO 50% BY WEIGHT ZINC SULFIDE AND FROM ABOUT 5% TO 50% BY WEIGHT ZINC OXIDE, ABOUT 0.005% TO ABOUT 0.5% BY WEIGHT COPPER, AND ABOUT 0.002% TO 0.1% BY WEIGHT SILVER AT A TEMPERATURE OF ABOUT 800*C. TO 1200*C. IN A CLOSED VESSEL.
Claim 2
Dependent Claim
65 words
A COPPER AND SILVER ACTIVATED ZINC SULFIDE-ZINC OXIDE, ELECTRO-LUMINESCENT FIELD RESPONSIVE, PHOSPHOR PRODUCED BY FIRING A MIXTURE OF FROM ABOUT 95% TO 50% BY WEIGHT ZINC SULFIDE AND FROM ABOUT 5% TO 50% BY WEIGHT ZINC OXIDE, ABOUT 0.005% TO ABOUT 0.5% BY WEIGHT COPPER, AND ABOUT 0.002% TO 0.1% BY WEIGHT SILVER AT A TEMPERATURE OF ABOUT 800*C. TO 1200*C. IN A CLOSED VESSEL.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |