Patent US2807587A successfully refreshed from Google Patents.
US2807587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blue electroluminescent zinc sulfide phosphors
Assignee: GTE Sylvania Inc
•
Filing: 1952-08-27
•
Granted: 1957-09-24
•
Expires: 1972-08-27
Abstract
No abstract record available.
Inventors
- 👤 Keith H Butler
- 👤 Horace H Homer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:14
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A BLUE-ELECTROLUMINESCENT PHOSPHOR CONSISTING ESSENTIALLY OF A ZINC SULFIDE PHOSPHOR CONTAINING LEAD ACTIVATOR IN AN AMOUNT BETWEEN .000003 AND .0001 GRAM-ATOM PER MOLE OF SULFIDE, BETWEEN ABOUT 0.0002 AND 0.008 GRAMATOM OF COPPER ACTIVATOR PER MOLE OF SULFIDE, AND CONTAINING CHLORIDE IN AN AMOUNT SUBSTANTIALLY LESS THAN THE AMOUNT OF COPPER AND BEING ABOUT 0.01% BY WEIGHT.
Claim 2
Dependent Claim
57 words
A BLUE-ELECTROLUMINESCENT PHOSPHOR CONSISTING ESSENTIALLY OF A ZINC SULFIDE PHOSPHOR CONTAINING LEAD ACTIVATOR IN AN AMOUNT BETWEEN .000003 AND .0001 GRAM-ATOM PER MOLE OF SULFIDE, BETWEEN ABOUT 0.0002 AND 0.008 GRAMATOM OF COPPER ACTIVATOR PER MOLE OF SULFIDE, AND CONTAINING CHLORIDE IN AN AMOUNT SUBSTANTIALLY LESS THAN THE AMOUNT OF COPPER AND BEING ABOUT 0.01% BY WEIGHT.
References Cited (Backward Citations)
US2447322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |