Patent US2731423A successfully refreshed from Google Patents.
US2731423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent materials and method of preparation
Assignee: General Electric Co
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Filing: 1951-09-08
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Granted: 1956-01-17
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Expires: 1971-09-08
Abstract
No abstract record available.
Inventors
- 👤 Jerome S Prener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:08
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
32 words
AN ELECTROLUMINESCENT PHOSPHOR COMPRISING A ZINC OXIDE REMOVED REMAINDER OF A FIRED MIXTURE OF ABOUT 60 PARTS ZINC SULFIDE, 15 PARTS ZINC SELENIDE, 25 PARTS ZINC OXIDE AND ABOUT 0.5 PART COPPER.
Claim 2
Dependent Claim
32 words
AN ELECTROLUMINESCENT PHOSPHOR COMPRISING A ZINC OXIDE REMOVED REMAINDER OF A FIRED MIXTURE OF ABOUT 60 PARTS ZINC SULFIDE, 15 PARTS ZINC SELENIDE, 25 PARTS ZINC OXIDE AND ABOUT 0.5 PART COPPER.
Claim 3
Independent Claim
116 words
THE METHOD OF PRODUCING AN ELECTROLUMINESCENT PHOSPHOR WHICH COMPRISES HEATING A MIXTURE OF ZINC SULFIDE, ZINC SELENIDE, THE RATIO OF ZINC SULFIDE TO ZINC SELENIDE BEING 3 TO 4 PARTS BY WEIGHT ZINC SULFIDE TO 1 PART ZINC SELENIDE, APPROXIMATELY 25% BY WEIGHT OF ZINC OXIDE, AND ABOUT 0.5% COPPER TO A TEMPERATURE OF ABOUT 1100* C. IN AN INERT ATMOSPHERE FOR ABOUT ONE-HALF HOUR, REHEATING TO A TEMPERATURE OF ABOUT 1100* C. IN AN ATMOSPHERE CONTAINING OXYGEN FOR ABOUT ONE-HALF HOUR, WASHING THE MIXTURE IN A BOILING 50% SOLUTION OF ACETIC ACID, AND FURTHER WASHING THE MIXTURE IN A DILUTE SOLUTION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM CYANIDE AND POTASSIUM CYANIDE.
Claim 4
Independent Claim
116 words
THE METHOD OF PRODUCING AN ELECTROLUMINESCENT PHOSPHOR WHICH COMPRISES HEATING A MIXTURE OF ZINC SULFIDE, ZINC SELENIDE, THE RATIO OF ZINC SULFIDE TO ZINC SELENIDE BEING 3 TO 4 PARTS BY WEIGHT ZINC SULFIDE TO 1 PART ZINC SELENIDE, APPROXIMATELY 25% BY WEIGHT OF ZINC OXIDE, AND ABOUT 0.5% COPPER TO A TEMPERATURE OF ABOUT 1100* C. IN AN INERT ATMOSPHERE FOR ABOUT ONE-HALF HOUR, REHEATING TO A TEMPERATURE OF ABOUT 1100* C. IN AN ATMOSPHERE CONTAINING OXYGEN FOR ABOUT ONE-HALF HOUR, WASHING THE MIXTURE IN A BOILING 50% SOLUTION OF ACETIC ACID, AND FURTHER WASHING THE MIXTURE IN A DILUTE SOLUTION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM CYANIDE AND POTASSIUM CYANIDE.
References Cited (Backward Citations)
US2546239A
Cited
US2531618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |