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US4024069A
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Yttrium tantalate phosphors
Assignee: RCA Licensing Corp
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Filing: 1975-07-16
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Granted: 1977-05-17
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Expires: 1995-07-16
Abstract
Abstract Phosphors consisting essentially of a host material having a face-centered cubic crystal structure and the empirical formula YTa3O9 or Y3TaO7 wherein 0.01 to 0.10 mol percent of the Y is replaced with at least one trivalent activator cation. A portion of the Y up to 20 mol percent may also be replaced with at least one trivalent nonactivator cation, such as Gd, La and Lu. The phosphors may be excited with ultraviolet light, x-rays or cathode rays to emit in the visible and ultraviolet regions of the spectrum depending on the excitation and the activator cations present.
Inventors
- 👤 Simon Larach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:26
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A phosphor consisting essentially of a host material having a face-centered cubic crystal structure and represented by the empirical formula [Y 1-x Ce x ] 3 TaO 7 , wherein x=0.0001 to 0.100 mol.
Claim 2
Dependent Claim
34 words
A phosphor consisting essentially of a host material having a face-centered cubic crystal structure and represented by the empirical formula [Y 1-x Ce x ] 3 TaO 7 , wherein x=0.0001 to 0.100 mol.
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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |