Patent US3631284A successfully refreshed from Google Patents.
US3631284A
Expired / Lapsed
US
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Red-emitting material for cathodoluminescent screens
Assignee: TDK Micronas GmbH
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Filing: 1968-01-19
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Granted: 1971-12-28
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Expires: 1988-01-19
Abstract
Abstract A phosphor of europium activated lithium indate provides a redemitting luminescent material of high brightness and good chromaticity and stability under electron beam excitation. The concentration of europium is relatively low in comparison with other similarly activated phosphors.
Inventors
- 👤 Thomas E Sisneros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:53
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
27 words
The device of claim 1 wherein said phosphor is activated by between 0.1 and 10 mole percent europium and has relatively stable color characteristics in that range.
References Cited (Backward Citations)
US3301791A
Cited
US3497458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |