Patent US4099089A successfully refreshed from Google Patents.
US4099089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent lamp utilizing terbium-activated rare earth oxyhalide phosphor material
Assignee: General Electric Co
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Filing: 1976-12-13
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Granted: 1978-07-04
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Expires: 1996-12-13
Abstract
Abstract Use of terbium-activated rare earth oxyhalide phosphor material in a high-loaded fluorescent lamp having an operating temperature range of approximately 100° C or greater provides high efficiency emission. The phosphor material can be utilized alone or in combination with other suitable phosphor materials at the elevated operating temperatures to generate white-light composite emission. For white-light emission, the phosphor admixture further includes a narrow band red-emitting phosphor along with a narrow band blue-emitting phosphor in suitable portions.
Inventors
- 👤 Jacob G. Rabatin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:14
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
147 words
In a high-loaded low-pressure type fluorescent lamp construction having an operating temperature range of approximately 100° C. or greater which comprises a light transmitting envelope containing an ionizing energy source, an ionizable gas atmosphere generating 2537 Angstrom radiation and a phosphor coating deposited on the inner surface of said light transmitting envelope, the improvement whereby said phosphor coating comprises a phosphor composition having the general formula: LnOx:Tb.sup.3+ wherein Ln is one or more of La and Gd, x is one or more of Cl, Br and I, and Tb is present as the sole activator element in activator concentrations from about .001 mole to about 0.3 mole per mole of phosphor, said phosphor exhibiting greater lumen efficiency at chromaticity values for the x coordinate in the range from about 0.305 to about 0.329 and for the y coordinate with the range from about 0.444 to about 0.500.
Claim 2
Dependent Claim
147 words
In a high-loaded low-pressure type fluorescent lamp construction having an operating temperature range of approximately 100° C. or greater which comprises a light transmitting envelope containing an ionizing energy source, an ionizable gas atmosphere generating 2537 Angstrom radiation and a phosphor coating deposited on the inner surface of said light transmitting envelope, the improvement whereby said phosphor coating comprises a phosphor composition having the general formula: LnOx:Tb.sup.3+ wherein Ln is one or more of La and Gd, x is one or more of Cl, Br and I, and Tb is present as the sole activator element in activator concentrations from about .001 mole to about 0.3 mole per mole of phosphor, said phosphor exhibiting greater lumen efficiency at chromaticity values for the x coordinate in the range from about 0.305 to about 0.329 and for the y coordinate with the range from about 0.444 to about 0.500.
Claim 3
Dependent Claim
18 words
a fluorescent lamp as in claim 1 wherein the phosphor coating comprises a combination of different phosphor compositions.
Claim 4
Dependent Claim
18 words
A fluorescent lamp as in claim 1 wherein the phosphor coating comprises an admixture of different phosphor compositions.
Claim 5
Dependent Claim
32 words
A fluorescent lamp as in claim 3 wherein the phosphor admixture further contains a narrow band red-emitting phosphor and a narrow band blue-emitting phosphor in preselected proportions to generate white-light composite emission.
Claim 6
Dependent Claim
27 words
A fluorescent lamp as in claim 1 wherein the ionizing energy source provides radio frequency energy and the ionizable gas atmosphere includes mercury and a rare gas.
Claim 7
Dependent Claim
42 words
A fluorescent lamp as in claim 1 wherein the light transmitting envelope is tubular shaped and contains a pair of spaced apart electrodes at each end along with a filling of an ionizable gas atmosphere which includes mercury and a rare gas.
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) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |