US3577350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Europium and manganese activated sodium or potassium aluminate phosphors
Assignee: Verizon Laboratories Inc
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Filing: 1968-11-27
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Granted: 1971-05-04
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Expires: 1988-11-27
Abstract
Abstract A PHOSPHOR SYSTEM CONSISTING OF AN ALKALI METAL B-ALUMINA ACTIVATED BY DIVALENT EUROPIUM OR BY DIVALENT EUROPIUM TOGETHER WITH DIVALENT MANGANESE. THESE PHOSPHORS ARE PHOTOLUMINESCENT AND CATHODOLUMINESCENT AND ARE SUITABLE FOR USE IN FLUORESCENT LAMPS OR CATHODE RAY TUBE SCREENS.
Inventors
- 👤 Robert L Amster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:35
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/7734; C09K11/7729
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |