US4499403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Skin tanning fluorescent lamp construction utilizing a phosphor combination
Assignee: General Electric Co
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Filing: 1979-09-06
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Granted: 1985-02-12
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Expires: 1999-09-06
Abstract
Abstract A skin tanning lamp construction of a fluorescent type is described utilizing a combination of two different phosphor materials in order to provide a more effective sun tanning source. The particular phosphor combination can be utilized as a blended mixture having a preselected level of one phosphor component to limit the amount of erythemal radiation produced by said mixture.
Inventors
- 👤 Elton T. Leppelmeier
- 👤 Frank I. Ewing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:13
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
An improved skin tanning fluorescent lamp having a sealed transparent envelope enclosing means to generate a low pressure mercury discharge within said envelope, and a coating contained within said envelope for conversion of at least a portion of the radiation emitted from said discharge to skin tanning radiation, the improved coating comprising a physical mixture consisting essentially of a first phosphor emitting in the 320-400 nanometer region of the spectrum and a second phosphor emitting in the 280-320 nanometer region of the spectrum, so that principal lamp emission resides in said 320-400 nanometer region, wherein the second phosphor is approximately 4-16% by weight of said coating.
Claim 2
Dependent Claim
106 words
An improved skin tanning fluorescent lamp having a sealed transparent envelope enclosing means to generate a low pressure mercury discharge within said envelope, and a coating contained within said envelope for conversion of at least a portion of the radiation emitted from said discharge to skin tanning radiation, the improved coating comprising a physical mixture consisting essentially of a first phosphor emitting in the 320-400 nanometer region of the spectrum and a second phosphor emitting in the 280-320 nanometer region of the spectrum, so that principal lamp emission resides in said 320-400 nanometer region, wherein the second phosphor is approximately 4-16% by weight of said coating.
Claim 3
Dependent Claim
17 words
The improved coating of claim 1 wherein the second phosphor is a lead-activated barium zinc silicate phosphor.
Claim 4
Dependent Claim
17 words
The improved coating of claim 1 wherein the first phosphor is a divalent europium-activated strontium borate phosphor
Claim 5
Dependent Claim
28 words
The improved coating of claim 1 wherein the improved coating is a physical mixture of a lead-activated barium zinc silicate phosphor and a divalent europium-activated strontium borate phosphor.
References Cited (Backward Citations)
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Cited
US3431215A
Cited
US3764840A
Cited
US3670193A
Cited
US4095113A
Cited
US4150321A
Cited
US4194125A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |