US2745811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blue electroluminescent zinc sulfide phosphor
Assignee: GTE Sylvania Inc
•
Filing: 1951-06-08
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Granted: 1956-05-15
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Expires: 1971-06-08
Abstract
No abstract record available.
Inventors
- 👤 Keith H Butler
- 👤 Horace H Homer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:54
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A BLUE-ELECTROLUMINESCING PHOSPHOR LOW CONDUCTIVITY, CONSISTING ESSENTIALLY OF CHLORIDE-FREE ZINC SULPHIDE ACTIVATED BY BETWEEN ABOUT 0.0002 AND ABOUT 0.0015 MOLE OF COPPER PER MOLE OF ZINC SULPHIDE AND CONTAINING BETWEEN ABOUT 0.01% AND 0.0001% LEAD BY WEIGHT.
Claim 2
Dependent Claim
37 words
A BLUE-ELECTROLUMINESCING PHOSPHOR LOW CONDUCTIVITY, CONSISTING ESSENTIALLY OF CHLORIDE-FREE ZINC SULPHIDE ACTIVATED BY BETWEEN ABOUT 0.0002 AND ABOUT 0.0015 MOLE OF COPPER PER MOLE OF ZINC SULPHIDE AND CONTAINING BETWEEN ABOUT 0.01% AND 0.0001% LEAD BY WEIGHT.
References Cited (Backward Citations)
US1944281A
Cited
US2447322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-15 | 1959-11-14 | 1960-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-15 | 1963-11-14 | 1964-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-15 | 1967-11-14 | 1968-05-15 | $7700.00 | Window Closed / Lapsed |