US2968627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent phosphor and method
Assignee: Westinghouse Electric Corp
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Filing: 1958-02-12
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Granted: 1961-01-17
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Expires: 1978-02-12
Abstract
No abstract record available.
Inventors
- 👤 Wachtel Anselm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:42
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
THE METHOD OF CHANGING FROM GREEN TO YELLOWISH THE ELECTROLUMINESCENT EMISSION OF CUPROUS-SULFIDE-SOLVENT UNWASHED, FINELY-DIVIDED, COOPER-ACTIVATED ZINC SULFIDE PHOSPHOR CONTAINING COOPER IN AMOUNT OF FROM 0.45 TO 1.1 GRAM-ATOM PERCENT OF THE ZINC SULFIDE AND AT LEAST ONE OF THE GROUP CONSISTING OF CHLORINE, BROMINE, IODINE AND ALUMINUM IN AMOUNT OF FROM 0.11 TO 0.65 GRAM-ATOM PERCENT OF THE ZINC SULFIDE, WHICH METHOD COMPRISES: ADMIXING WITH SAID PHOSPHOR FROM ABOUT 5 TO ABOUT 19 MOLAR PERCENT OF THE ZINC SULFIDE OF FINELY-DIVIDED CADMIUM SULFIDE; AND FIRING SAID ADMIXTURE IN AN INERT ATMOSPHERE AT FROM 610*C. TO 750*C. FROM AT LEAST 1/3 HOUR; THEREAFTER WASHING SAID FIRE ADMIXTURE IN A SOLUTION WHICH IS A SOLVENT FOR CUPROUS SULFIDE BUT WHICH IS NOT A SULVENT FOR ZINC AND CADMIUM SULFIDES.
Claim 2
Dependent Claim
88 words
A YELLOW-EMITTING COPPER-ACTIVATED ZINC-CADMIUM SULFIDE ELECTROLUMINESCENT PHOSPHOR COMPRISING, FINELY-DIVIDED ZINC-CADMIUM SULFIDE THE INDIVIDUAL PARTICLES OF WHICH ARE INTERIORLY PREDOMINATELY ZINC SULFIDE AND EXTERIORLY RICH IN CADMIUM SULFIDE, THE MOLAR PERCENT OF CADMINUM SULFIDE TO ZINC SULFIDE BEING FROM ABOUT 5 TO ABOUT 19 AND SAID PHOSPHOR CONTAINING COPPER IN AMOUNT OF FROM 0.45 TO 1.1 GRAM-ATOM PERCENT OF THE ZINC SULFIDE AND AT LEAST ONE OF THE GROUP CONSISTING OF CHLORINE, BROMINE, IODINE AND ALUMINUM IN AMOUNT OF FROM 0.11 TO 0.65 GRAM-ATOM PERCENT OF THE ZINC SULFIDE.
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) | 1964-01-17 | 1964-07-18 | 1965-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-17 | 1968-07-18 | 1969-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-17 | 1972-07-18 | 1973-01-17 | $7700.00 | Window Closed / Lapsed |