US5213712A
Expired / Lapsed
US
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Lanthanum lutetium oxide phosphor with cerium luminescence
Assignee: General Electric Co
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Filing: 1992-02-10
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Granted: 1993-05-25
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Expires: 2012-02-10
Abstract
Abstract A phosphor comprising, an ABO3 oxide compound wherein A is about 0.002 to 22 atomic percent cerium and up to about 22 atomic percent lanthanum, and B is about 18 to 22 atomic percent of at least one of lutetium or yttrium.
Inventors
- 👤 Stephen L. Dole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:21
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
62 words
A phosphor consisting essentially of, an oxide compound having the formula ABO 3 wherein A is cerium and lanthanum, and B is at least one of lutetium or yttrium, wherein A or B can vary by up to 2 atom percent from the 1:1 ratio of the formula, and cerium is present in an amount of about 0.02 to 2 atom percent.
Claim 2
Dependent Claim
62 words
A phosphor consisting essentially of, an oxide compound having the formula ABO 3 wherein A is cerium and lanthanum, and B is at least one of lutetium or yttrium, wherein A or B can vary by up to 2 atom percent from the 1:1 ratio of the formula, and cerium is present in an amount of about 0.02 to 2 atom percent.
Claim 3
Dependent Claim
24 words
A phosphor according to claim 1 wherein cerium is present in an amount of about 0.2 to 2 atom percent, and B is lutetium.
References Cited (Backward Citations)
GB1208565A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |