Patent US3249552A successfully refreshed from Google Patents.
US3249552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for processing electroluminescent phosphor
Assignee: Philips North America LLC
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Filing: 1963-02-19
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Granted: 1966-05-03
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Expires: 1983-02-19
Abstract
No abstract record available.
Inventors
- 👤 Lehmann Willi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:23
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
THE METHOD OF IMPROVING THE PERFORMANCE OBTAINABLE FROM ELECTROLUMINESCENT PHOSPHOR HAVING A MATRIX CONSISTING ESSENTIALLY OF ONE MATERIAL OF THE GROUP CONSISTING OF ZINC SULFIDE AND ZINC-CADMIUM SULFIDE AND INCLUDING COPPER AS ACTIVATOR WHICH METHOD COMPRISES: (A) FIRING PREDETERMINED PROPORTIONS OF MIXED SELECTED RAW-MIX CONSTITUENTS, AS REQUIRED TO FORM THE PHOSPHOR, IN A CONTAINER WHICH IS UNSEALED BUT WHICH INHIBITS FLOW OF GASES THEREFROM AT A TEMPERATURE OF AT LEASTS 600*C. FOR A SUFFICIENT TIME TO REACT THE RAWMIX CONSTITUENTS AND FORM THE ELECTROLUMINESCENT PHOSPHOR, WHILE MAINTAINING A SULFURIZING ATMOSPHERE ABOUT THE PHOSPHOR RAW-MIX CONSTITUENT DURING THE ENTIRE FIRING PERIOD; AND (B) IMMEDIATELY UPON COMPLETION OF FIRING AND UNTIL THE TEMPERATURE OF THE FIRED PHOSPHOR HAS COOLED TO LESS THAN ABOUT 200*C., MAINTAINING THE PHOSPHOR IN THE UNSEALED CONTAINER WITH THE ATMOSPHERE ABOUT THE PHOSPHOR SUBSTANTIALLY SATURATED WITH SULFUR VAPOR.
Claim 2
Independent Claim
140 words
THE METHOD OF IMPROVING THE PERFORMANCE OBTAINABLE FROM ELECTROLUMINESCENT PHOSPHOR HAVING A MATRIX CONSISTING ESSENTIALLY OF ONE MATERIAL OF THE GROUP CONSISTING OF ZINC SULFIDE AND ZINC-CADMIUM SULFIDE AND INCLUDING COPPER AS ACTIVATOR WHICH METHOD COMPRISES: (A) FIRING PREDETERMINED PROPORTIONS OF MIXED SELECTED RAW-MIX CONSTITUENTS, AS REQUIRED TO FORM THE PHOSPHOR, IN A CONTAINER WHICH IS UNSEALED BUT WHICH INHIBITS FLOW OF GASES THEREFROM AT A TEMPERATURE OF AT LEASTS 600*C. FOR A SUFFICIENT TIME TO REACT THE RAWMIX CONSTITUENTS AND FORM THE ELECTROLUMINESCENT PHOSPHOR, WHILE MAINTAINING A SULFURIZING ATMOSPHERE ABOUT THE PHOSPHOR RAW-MIX CONSTITUENT DURING THE ENTIRE FIRING PERIOD; AND (B) IMMEDIATELY UPON COMPLETION OF FIRING AND UNTIL THE TEMPERATURE OF THE FIRED PHOSPHOR HAS COOLED TO LESS THAN ABOUT 200*C., MAINTAINING THE PHOSPHOR IN THE UNSEALED CONTAINER WITH THE ATMOSPHERE ABOUT THE PHOSPHOR SUBSTANTIALLY SATURATED WITH SULFUR VAPOR.
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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |