Patent US3303141A successfully refreshed from Google Patents.
US3303141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing of electroluminescent phosphors
Assignee: Philips North America LLC
•
Filing: 1963-10-03
•
Granted: 1967-02-07
•
Expires: 1983-10-03
Abstract
No abstract record available.
Inventors
- 👤 Philip M Jaffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:56
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
THE METHOD OF IMPROVING THE MAINTENANCE OF LIGHT EMISSION OBTAINABLE FROM AN ELECTROLUMINESCENT DEVICE INCORPORATING ELECTROLUMINESCENT PHOSPHOR HAVING A MATRIX AT LEAST PRINCIPALLY COMPRISING ZINC SULFIDE AND INCLUDING COPPER AS ACTIVATOR, WHICH PHOSPHOR HAS INITIALLY BEEN PREPARED BY FIRING THE PHOSPHOR RAW-MIX CONSTITUENTS IN A SULFURIZING ATMOSPHERE AT A PREDETERMINED TEMPERATURE FOR A PREDETERMINED PERIOD OF TIME, WHICH METHOD COMPRISES: AFTER INITIAL PREPARATION BUT BEFORE THE PHOSPHOR IS INCORPORATED INTO AN ELECTROLUMINESCENT DEVICE, BAKING THE PHOSPHOR IN AN ATMOSPHERE OF AMMONIA OR SULFUR DIOXIDE AT A TEMPERATURE OF FROM 450*C. TO 700*C. FOR A PERIOD OF AT LEAST ABOUT ONE HOUR.
Claim 2
Independent Claim
101 words
THE METHOD OF IMPROVING THE MAINTENANCE OF LIGHT EMISSION OBTAINABLE FROM AN ELECTROLUMINESCENT DEVICE INCORPORATING ELECTROLUMINESCENT PHOSPHOR HAVING A MATRIX AT LEAST PRINCIPALLY COMPRISING ZINC SULFIDE AND INCLUDING COPPER AS ACTIVATOR, WHICH PHOSPHOR HAS INITIALLY BEEN PREPARED BY FIRING THE PHOSPHOR RAW-MIX CONSTITUENTS IN A SULFURIZING ATMOSPHERE AT A PREDETERMINED TEMPERATURE FOR A PREDETERMINED PERIOD OF TIME, WHICH METHOD COMPRISES: AFTER INITIAL PREPARATION BUT BEFORE THE PHOSPHOR IS INCORPORATED INTO AN ELECTROLUMINESCENT DEVICE, BAKING THE PHOSPHOR IN AN ATMOSPHERE OF AMMONIA OR SULFUR DIOXIDE AT A TEMPERATURE OF FROM 450*C. TO 700*C. FOR A PERIOD OF AT LEAST ABOUT ONE HOUR.
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) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |