US4097762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xenon arc discharge lamp having a particular electrode composition and wherein the arc discharge is obtained without heating the electrode
Assignee: Triton Services Inc
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Filing: 1977-05-17
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Granted: 1978-06-27
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Expires: 1997-05-17
Abstract
Abstract An electrode for an arc discharge lamp includes a porous sintered body of tungsten impregnated with a mixture of alkaline earth oxides and a metal oxide. The alkaline earth materials may be oxides of barium and calcium, and the metal oxide may be aluminum oxide. The body is brazed or welded to the end of a high melting point refractory metal support of tungsten or molybdenum. Two identical electrodes are used as the cathodes of a long arc alternating current type xenon lamp and one such electrode provides the cathode of a short arc direct current xenon lamp. The structure and materials provide greater efficiency and extended life under continuous operating conditions.
Inventors
- 👤 Joseph James Hilton
- 👤 James Joseph Malloy, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:06
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
In a xenon arc discharge lamp comprising an enclosed pressurized sealed optical envelope having a light transparent window, a pair of electrodes at opposite ends of said lamp, and means for applying a potential across said electrodes to provide an arc discharge therebetween, the improvement in which at least one of said electrodes comprises a porous sintered body of a refractory metal selected from the group consisting of tungsten and molybdenum, said body being impregnated with a fused mixture of alkaline earth oxides and a metal oxide, said arc discharge being obtained solely through field emission by application of said potential without heating said electrode.
Claim 2
Dependent Claim
105 words
In a xenon arc discharge lamp comprising an enclosed pressurized sealed optical envelope having a light transparent window, a pair of electrodes at opposite ends of said lamp, and means for applying a potential across said electrodes to provide an arc discharge therebetween, the improvement in which at least one of said electrodes comprises a porous sintered body of a refractory metal selected from the group consisting of tungsten and molybdenum, said body being impregnated with a fused mixture of alkaline earth oxides and a metal oxide, said arc discharge being obtained solely through field emission by application of said potential without heating said electrode.
Claim 3
Dependent Claim
41 words
The electrode of claim 1 wherein said body is of tungstem impregnated with barium calcuim aluminate and wherein said barium calcium aluminate is of the ratio of 4 parts BaO, 1 part CaO and 1 part A1 2 O 3 .
Claim 4
Dependent Claim
16 words
The device of claim 1 wherein both electrodes of said pair are of the same material.
Claim 5
Dependent Claim
33 words
The device of claim 1 wherein said electrode includes a support of refractory metal selected from the group consisting of tungsten and molybdenum, said body being brazed to the end of said support.
Claim 6
Dependent Claim
16 words
The device of claim 4 wherein said body is of tungsten impregnated with barium calcium aluminate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |