US3034990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doubly fired electroluminescent phosphors and method for their preparation
Assignee: EIDP Inc
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Filing: 1958-12-11
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Granted: 1962-05-15
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Expires: 1978-12-11
Abstract
No abstract record available.
Inventors
- 👤 Wayrynen Robert Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:22
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A METHOD FOR PREPARING AN ELECTROLUMINESCENT PHOSPHOR WHICH COMPRISES MIXING AT LEAST ONE PURE, CHLORIDEFREE ZIND COMPOUND SELECTED FROM THE GROUP CONSISTING OF ZINC SULFIDE AND ZINC SELENIDE WITH 0.00001 TO 0.01 GRAM ATOM PER MOLE OF ZINC COMPOND OF A CHLORIDE-FREE ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF ARSENIC, ANTIMONY, BISMUTH AND LEAD CONTAINING ACTIVATORS, FIRING THIS MIXTURE AT A TEMPERATURE OF FROM 600* C. TO 1050* C. FOR A PERIOD OF FROM 1/2 TO 10 HOURS, SUBSEQUENTLY ADDING THERETO 0.0001 TO 0.05 GRAM ATOM OF COPPER PER MOLE OF ZINC COMPOUND, 1 TO 10% OF HALIDE FLUX COMPOUND BASED ON THE WEIGHT OF ZINC COMPOUND AND REFIRING AT A TEMPERATURE OF FROM 600* C. TO 1050* C. FOR A PERIOD OF FROM 1/2 TO 10 HOURS.
Claim 2
Independent Claim
128 words
A METHOD FOR PREPARING AN ELECTROLUMINESCENT PHOSPHOR WHICH COMPRISES MIXING AT LEAST ONE PURE, CHLORIDEFREE ZIND COMPOUND SELECTED FROM THE GROUP CONSISTING OF ZINC SULFIDE AND ZINC SELENIDE WITH 0.00001 TO 0.01 GRAM ATOM PER MOLE OF ZINC COMPOND OF A CHLORIDE-FREE ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF ARSENIC, ANTIMONY, BISMUTH AND LEAD CONTAINING ACTIVATORS, FIRING THIS MIXTURE AT A TEMPERATURE OF FROM 600* C. TO 1050* C. FOR A PERIOD OF FROM 1/2 TO 10 HOURS, SUBSEQUENTLY ADDING THERETO 0.0001 TO 0.05 GRAM ATOM OF COPPER PER MOLE OF ZINC COMPOUND, 1 TO 10% OF HALIDE FLUX COMPOUND BASED ON THE WEIGHT OF ZINC COMPOUND AND REFIRING AT A TEMPERATURE OF FROM 600* C. TO 1050* C. FOR A PERIOD OF FROM 1/2 TO 10 HOURS.
References Cited (Backward Citations)
US2774739A
Cited
US2802792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-14 | 1965-11-13 | 1966-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-14 | 1969-11-13 | 1970-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-14 | 1973-11-13 | 1974-05-15 | $7700.00 | Window Closed / Lapsed |