US2774739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making an electroluminescent phosphor
Assignee: GTE Sylvania Inc
•
Filing: 1952-07-22
•
Granted: 1956-12-18
•
Expires: 1972-07-22
Abstract
No abstract record available.
Inventors
- 👤 Keith H Butler
- 👤 Richard M Rulon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:50
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
THE METHOD OF MAKING AN ELECTROLUMINESCENT PHOSPHOR WHICH COMPRISE: FIRING A MIXTURE OF ZINC SULFIDE WITH BETWEEN ABOUT 0.0004 TO ABOUT 0.0015 GRAM ATOM OF COPPER FOR EACH MOLE OF ZINC SULFIDE; THEN MIXING THE RESULTANT MATERIAL WITH BETWEEN ABOUT 0.0002 AND ABOUT 0.0012 GRAM ATOM OF LEAD PER MOLE OF ZINC SULFIDE AND A SMALL AMOUNT OF ZINC OXIDE, AND FIRING THE MIXTURE.
Claim 2
Independent Claim
64 words
THE METHOD OF MAKING AN ELECTROLUMINESCENT PHOSPHOR WHICH COMPRISE: FIRING A MIXTURE OF ZINC SULFIDE WITH BETWEEN ABOUT 0.0004 TO ABOUT 0.0015 GRAM ATOM OF COPPER FOR EACH MOLE OF ZINC SULFIDE; THEN MIXING THE RESULTANT MATERIAL WITH BETWEEN ABOUT 0.0002 AND ABOUT 0.0012 GRAM ATOM OF LEAD PER MOLE OF ZINC SULFIDE AND A SMALL AMOUNT OF ZINC OXIDE, AND FIRING THE MIXTURE.
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) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |