US5196759A
Expired / Lapsed
US
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High temperature lamps having UV absorbing quartz envelope
Assignee: General Electric Co
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Filing: 1992-02-28
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Granted: 1993-03-23
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Expires: 2012-02-28
Abstract
Abstract Fused quartz containing both titanium dioxide and cerium oxide as UV absorbing dopants has been found to be particularly effective for lamp envelopes for high temperature lamps such as halogen-incandescent lamps and metal halide arc discharge lamps which emit both UV and visible light radiation. The codoped quartz transmits visible radiation and absorbs a substantial portion of the emitted UV radiation. The UV absorption is far superior at temperatures above 500° C. and the codoped quartz does not react with the fill within.
Inventors
- 👤 Thomas G. Parham
- 👤 Robert L. Bateman, Jr.
- 👤 Gary R. Allen
- 👤 Paul G. Mathews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:40
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/302; H01J61/38; H01J61/40
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
58 words
A lamp comprising a light source which emits both UV and visible light radiation surrounded by a UV-absorbing and visible light transmissive fused quartz envelope codoped with both titanium dioxide and cerium oxide to absorb at least a portion of said UV radiation, with said envelope being at a temperature above 500° C. during operation of said lamp.
Claim 2
Dependent Claim
58 words
A lamp comprising a light source which emits both UV and visible light radiation surrounded by a UV-absorbing and visible light transmissive fused quartz envelope codoped with both titanium dioxide and cerium oxide to absorb at least a portion of said UV radiation, with said envelope being at a temperature above 500° C. during operation of said lamp.
Claim 3
Dependent Claim
17 words
The lamp of claim 1 wherein said source of UV and visible light radiation comprises a filament.
Claim 4
Dependent Claim
9 words
The lamp of claim 2 comprising a halogen-incandescent lamp.
Claim 5
Dependent Claim
18 words
The lamp of claim 1 wherein said source of UV and visible light radiation comprises an arc discharge.
Claim 6
Dependent Claim
15 words
The lamp of claim 4 including at least one metal halide in said arc discharge.
Claim 7
Dependent Claim
75 words
An incandescent lamp having a light source comprising a filament light source hermetically sealed within a fused quartz envelope, wherein said light source emits both UV and visible light radiation and wherein said fused quartz envelope is codoped with both titanium dioxide and cerium oxide to absorb at least a portion of said UV radiation emitted by said light source, with said envelope being at a temperature above 500° C. during operation of said lamp.
Claim 8
Dependent Claim
75 words
An incandescent lamp having a light source comprising a filament light source hermetically sealed within a fused quartz envelope, wherein said light source emits both UV and visible light radiation and wherein said fused quartz envelope is codoped with both titanium dioxide and cerium oxide to absorb at least a portion of said UV radiation emitted by said light source, with said envelope being at a temperature above 500° C. during operation of said lamp.
Claim 9
Dependent Claim
15 words
The lamp of claim 6 wherein at least one halogen is enclosed within said envelope.
Claim 10
Dependent Claim
12 words
The lamp of claim 7 wherein said filament is a tungsten filament.
Claim 11
Dependent Claim
27 words
The lamp of claim 8 wherein said cerium oxide is selected from the group consisting essentially of CeO 2 , Ce 2 O 3 and mixture thereof.
Claim 12
Dependent Claim
33 words
The lamp of claim 9 wherein the amount of both titanium and cerium present in said titanium dioxide and said cerium oxide does not exceed 0.5 wt. % of said fused quartz composition.
Claim 13
Dependent Claim
17 words
The lamp of claim 10 wherein said titanium is present in a valence state of plus four.
Claim 14
Dependent Claim
67 words
An arc discharge lamp comprising an arc discharge which emits both UV and visible light radiation enclosed within a visible, light-transmissive envelope made of fused quartz codoped with both titanium dioxide and cerium oxide to absorb at least a portion of said UV radiation emitted by said arc discharge and wherein said envelope is at a temperature of greater than 500° C. during operation of said lamp.
Claim 15
Dependent Claim
67 words
An arc discharge lamp comprising an arc discharge which emits both UV and visible light radiation enclosed within a visible, light-transmissive envelope made of fused quartz codoped with both titanium dioxide and cerium oxide to absorb at least a portion of said UV radiation emitted by said arc discharge and wherein said envelope is at a temperature of greater than 500° C. during operation of said lamp.
Claim 16
Dependent Claim
16 words
The lamp of claim 12 further including at least one metal halide in said arc discharge.
Claim 17
Dependent Claim
14 words
The lamp of claim 13 wherein said arc discharge is an electrodeless arc discharge.
Claim 18
Dependent Claim
70 words
An arc discharge lamp comprising an arc discharge which emits both UV and visible light radiation enclosed within a fused quartz arc chamber and wherein a fused quartz shroud codoped with both titanium dioxide and cerium oxide surrounds said arc chamber to absorb at least a portion of said UV radiation emitted by said arc discharge, said shroud being at a temperature above 500° C. during operation of said lamp.
Claim 19
Dependent Claim
70 words
An arc discharge lamp comprising an arc discharge which emits both UV and visible light radiation enclosed within a fused quartz arc chamber and wherein a fused quartz shroud codoped with both titanium dioxide and cerium oxide surrounds said arc chamber to absorb at least a portion of said UV radiation emitted by said arc discharge, said shroud being at a temperature above 500° C. during operation of said lamp.
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) | 1996-03-22 | 1996-09-21 | 1997-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-22 | 2000-09-21 | 2001-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-22 | 2004-09-21 | 2005-03-23 | $7700.00 | Window Closed / Lapsed |