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US3555337A
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Electric discharge device with dysprosium activated yttrium vanadate phosphors
Assignee: GTE Sylvania Inc
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Filing: 1968-09-17
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Granted: 1971-01-12
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Expires: 1988-09-17
Abstract
Abstract Compounds of dysprosium activated yttrium vanadate are novel and useful phosphors which luminesce when exposed to a source of activating radiation. The phosphors of the present invention can be advantageously employed in low pressure and high pressure electric discharge devices such as fluorescent or mercury lamps and the like.
Inventors
- 👤 Sixdeniel Faria
- 👤 Dominic T Palumbo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:24
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7776
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
22 words
The device according to claim 1 wherein there is between about 0.05 to 10 mole percent dysprosium per mole of yttrium vanadate.
Claim 2
Dependent Claim
35 words
The device according to claim 1 wherein an additional rare earth metal is disposed in the matrix as a coactivator with the dysprosium, said additional rare earth metal being in quantities less than the dysprosium.
Claim 3
Dependent Claim
21 words
The device according to claim 3 wherein said additional rare earth metal is europium, erbium, samarium, praseodymium, thulium or mixtures thereof.
Claim 4
Dependent Claim
58 words
A high pressure mercury lamp comprising: an arc tube adapted to emit a mercury discharge, an enclosing light transmitting outer jacket disposed about said arc tube and a phosphor powder coated upon the interior surface of said outer jacket and adapted to be excited by said mercury discharge, said phosphor consisting essentially of yttrium vanadate activated by dysprosium.
Claim 5
Dependent Claim
22 words
The lamp according to claim 5 wherein there is between about 0.05 to 10 mole percent dysprosium per mole of yttrium vanadate.
Claim 6
Dependent Claim
35 words
The lamp according to claim 5 wherein an additional rare earth metal is disposed in the matrix as a coactivator with the dysprosium, said additional rare earth metal being in quantities less than the dysprosium.
Claim 7
Dependent Claim
21 words
The lamp according to claim 7 wherein said additional rare earth metal is europium, erbium, samarium, praseodymium, thulium or mixtures thereof.
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |