US3152995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for increasing the brightness of electroluminescent phosphors
Assignee: GTE Sylvania Inc
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Filing: 1960-07-12
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Granted: 1964-10-13
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Expires: 1980-07-12
Abstract
No abstract record available.
Inventors
- 👤 Lester W Strock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:58
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145; H05B33/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
THE PROCESS OF INCREASING THE EMISSION BRIGHNESS OF A COPPER-ACTIVATED ZINC SULFIDE ELECTROLUMINESCENT PHOSPHOR, SAID PROCESS COMPRISING THE STEPS OF ADDING A CHLORIDE TO SAID PHOSPHOR, HEATING TO ABOUT 400*C., AND THEN EXPOSING THE PHOSPHOR AT A HIGHER TEMPERATURE BELOW 800*C. TO A SOURCE OF OXYGEN.
Claim 2
Dependent Claim
46 words
THE PROCESS OF INCREASING THE EMISSION BRIGHNESS OF A COPPER-ACTIVATED ZINC SULFIDE ELECTROLUMINESCENT PHOSPHOR, SAID PROCESS COMPRISING THE STEPS OF ADDING A CHLORIDE TO SAID PHOSPHOR, HEATING TO ABOUT 400*C., AND THEN EXPOSING THE PHOSPHOR AT A HIGHER TEMPERATURE BELOW 800*C. TO A SOURCE OF OXYGEN.
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) | 1967-10-13 | 1968-04-13 | 1968-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-13 | 1972-04-13 | 1972-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-13 | 1976-04-13 | 1976-10-13 | $7700.00 | Window Closed / Lapsed |