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US4436646A
Expired / Lapsed
US
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Green-emitting phosphor for cathode-ray tube
Assignee: Toshiba Corp
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Filing: 1982-09-22
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Granted: 1984-03-13
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Expires: 2002-09-22
Abstract
Abstract A green-emitting phosphor for a cathode-ray tube contains calcium sulfide activated by cerium and lithium. Decreases in the brightness when the tube is excited with an electron beam of high current densities or is subjected to high temperatures are eliminated.
Inventors
- 👤 Takeshi Takahara
- 👤 Takeo Sato
- 👤 Takeo Itou
- 👤 Masaaki Tamatani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:08
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7715; C09K11/7716; C09K11/7718
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A green-emitting phosphor for a cathode-ray tube, consisting of calcium sulfide activated by cerium and lithium, the cerium concentration being within the range of 0.06 to 0.5 mol % and the lithium concentration being in the range 0.05 to 0.4 mol % said phosphor exhibiting a higher luminous efficiency than calcium sulfide phosphor activated by cerium and sodium when excited at a current density of 4 μA/cm 2 .
Claim 2
Dependent Claim
69 words
A green-emitting phosphor for a cathode-ray tube, consisting of calcium sulfide activated by cerium and lithium, the cerium concentration being within the range of 0.06 to 0.5 mol % and the lithium concentration being in the range 0.05 to 0.4 mol % said phosphor exhibiting a higher luminous efficiency than calcium sulfide phosphor activated by cerium and sodium when excited at a current density of 4 μA/cm 2 .
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) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |