US3753028A
Expired / Lapsed
US
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Discharge lamp electrode
Assignee: Compagnie des Lampes
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Filing: 1971-04-27
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Granted: 1973-08-14
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Expires: 1991-04-27
Abstract
Abstract This discharge lamp electrode comprises a cylindrical tungsten rod having fitted and welded to its upper end a coil of spiralwound wire of the same metal and two small disks, i.e. a thorium emitting disk and a titanium-emitting disk disposed above the end of the cylindrical tungsten rod; the thorium emitting disks consists of tungsten powder sintered under a relatively high pressure to constitute a skeleton, and the titanium emitting disk consists of a tungsten skeleton in which titanium is incorporated; other coils of spiral-wound tungsten wire are disposed around said disks and locked in position by weld spots.
Inventors
- 👤 Y Renaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:51
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/073; H01J61/0735; H01J61/0737
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
79 words
Electrode according to claim 1, characterized in that the coil of spiral-wound wire consists of a first coil section fitted to the upper end of the tungsten rod and of a second coil section having its lower portion screwed to the upper portion of the first coil section, said second coil section comprising at its upper portion an internal layer of spiral-wound wire in order to constitute the chamber in which the thorium emitting disk is disposed and retained.
Claim 2
Dependent Claim
34 words
Electrode according to claim 1, characterized in that said thorium emitting disk consists of comprises a sintered homogeneous mixture of a powder refractory metal and a substance which is thorium emitting at high temperature.
Claim 3
Dependent Claim
47 words
Electrode for discharge lamp, according to claim 3 wherein there are two disks and the second disk is a getter disk comprising a sintered homogeneous mixture of a powder refractory metal and a element selected from the group consisting of titanium, zirconium, hafnium, tantalum, vanadium and niobium.
Claim 4
Dependent Claim
73 words
Electrode for discharge lamp according to claim 4, characterized in that the lamp is a 2 kW lamp and the thorium emitting disk has a diameter of 2.5 mm, a thickness of 0.65 mm and weighs about 50 m/g, the composition of said disk consisting essentially of about 45 m/g of tungsten powder having a granulometry of a few microns, 5 m/g of thorium oxide and 0.5 m/g of very finely ground thorium.
Claim 5
Dependent Claim
48 words
Electrode for discharge lamp according to claim 5, characterized in that the second disk is a sintered mixture of powder refractory metal and titanium which consists essentially of about 45 m/g of tungsten and 10 to 50 percent of titanium powder having a granulometry of a few microns.
Claim 6
Dependent Claim
15 words
Electrode for discharge lamp according to claim 4, characterized in that the element is titanium.
Claim 7
Dependent Claim
20 words
Discharge lamp electrode according to claim 4, characterized in that said disks are fastened to each other by weld spots.
Claim 8
Dependent Claim
28 words
The electrode of claim 3 wherein the refractory metal is tungsten and the thorium emitting substance is selected from the group consisting of thorine, thorium and mixtures thereof.
Claim 9
Dependent Claim
15 words
The electrode of claim 4 wherein the refractory metal of the second disk is tungsten.
Claim 10
Dependent Claim
134 words
A discharge lamp electrode comprising a cylindrical tungsten rod, a first tungsten coil section fitted and welded to the upper end of said tungsten rod, a second tungsten coil section having its lower portion screwed around the upper section of the first coil section, a third tungsten coil section having at least its lower portion screwed in the upper portion of the second coil section in order to constitute a chamber, a thorium emitting element disposed and retained in said chamber, said thorium emitting element consisting of a small disk obtained by sintering under a very high pressure a mixture of a powder of a suitable refractory metal such as tungsten to constitute a kind of skeleton, and of at least another substance adapted to emit thorium when heated at a relatively high temperature.
Claim 11
Dependent Claim
20 words
A discharge lamp electrode according to claim 11, in which said first two coil sections of tungsten are welded together.
Claim 12
Dependent Claim
33 words
A discharge lamp electrode according to claim 11, in which a second small disk of titanium emitting material is disposed and retained in said chamber under the disk of the thorium emitting element.
Claim 13
Dependent Claim
34 words
A discharge lamp Electrode according to claim 13, in which said third tungsten coil section is screwed in the second tungsten coil section so that the two disks are strongly pressed against each other.
Claim 14
Dependent Claim
75 words
Electrode for discharge lamp according to claim 11 characterized in that in the case of a 2 kW lamp the thorium emitting element consists of a small disk having a diameter of 2.5mm, a thickness of 0.65 mm and weighing about 50 m/g, the composition of said disk including about 45 m/g of tungsten powder having a granulometry of a few microns, 5 m/g of thorium oxide and 0.5 m/g of very finely ground thorium.
Claim 15
Dependent Claim
45 words
Electrode for discharge lamp according to claim 13, characterized in that in the case of a 2 kW lamp, the titanium containing element consists of about 45 m/g of tungsten and 10 to 50 percent of titanium powder having a granulometry of a few microns.
Claim 16
Dependent Claim
29 words
Discharge lamp electrode according to claim 13, characterized in that the titanium is replaced by a material of the same group, such as zirconium, hafnium, tantalum, vanadium and niobium.
Claim 17
Dependent Claim
20 words
Discharge lamp electrode according to claim 13, characterized in that said disks are fastened to each other by weld spots.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |