US3629915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc lamp construction
Assignee: Republic National Bank of Dallas
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Filing: 1969-10-13
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Granted: 1971-12-28
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Expires: 1989-10-13
Abstract
Abstract An arc lamp construction in which the lamp envelope portion surrounding the main body portions of the arc electrodes is spaced therefrom to define a cylindrical gap and in which a packing member is disposed in the cylindrical gap to support the electrodes. The packing member is elastic, or radially deformable, to prevent cracking of the envelope as the gap width changes with temperature, and is thermally conductive to allow the transfer of electrode heat across the gap to the envelope.
Inventors
- 👤 Raymond E Paquette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:04
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/88; H01J1/96; H01J61/00; H01J61/98; H01J9/00; H01J9/24; H01J9/36
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
118 words
In the method of constructing an arc lamp having a pair of cantilever supported, spaced-apart, refractory electrodes disposed within an envelope, the improvement comprising the steps of: winding a coil of refractory wire around a portion of at least one of said electrodes prior to placing the same in the envelope, the wire-wound portion being disposed on the side of the cantilevered portion adjacent the arc end of the electrode; heating the sealed envelope, with the electrodes in place and the envelope under negative pressure, to the normal arc lamp operating temperature; and shrinking the portion of the envelope opposite said coil of wire without wetting on to said coil or wire for lateral support of the electrode.
Claim 2
Dependent Claim
118 words
In the method of constructing an arc lamp having a pair of cantilever supported, spaced-apart, refractory electrodes disposed within an envelope, the improvement comprising the steps of: winding a coil of refractory wire around a portion of at least one of said electrodes prior to placing the same in the envelope, the wire-wound portion being disposed on the side of the cantilevered portion adjacent the arc end of the electrode; heating the sealed envelope, with the electrodes in place and the envelope under negative pressure, to the normal arc lamp operating temperature; and shrinking the portion of the envelope opposite said coil of wire without wetting on to said coil or wire for lateral support of the electrode.
Claim 3
Dependent Claim
44 words
The method in accordance with claim 1 which includes the additional step of forming a spiral groove in the interior surface of the portion of the envelope being shrunk upon the coil of wire to partially accommodate the coil of wire for longitudinal support.
Claim 4
Independent Claim
129 words
The method of constructing an arc lamp having a pair of cantilevered, spaced-apart electrodes disposed within an envelope, said method comprising the steps of: winding a coil of refractory wire around the normally unsupported portions of each of said electrodes prior to placing the electrodes within the envelope; sealing the envelope under a reduced internal pressure and hard-shrinking the envelope about the electrodes feed adjacent the normally unsupported portion of the electrode on the side opposite the arc end to provide the cantilevered support; heating the envelope, electrodes, and coils of wire to the normal arc lamp operating temperature with a negative pressure inside the envelope to shrink the envelope without wetting about said coils of wire to provide electrode body support at the normal arc lamp operating temperature.
Claim 5
Independent Claim
129 words
The method of constructing an arc lamp having a pair of cantilevered, spaced-apart electrodes disposed within an envelope, said method comprising the steps of: winding a coil of refractory wire around the normally unsupported portions of each of said electrodes prior to placing the electrodes within the envelope; sealing the envelope under a reduced internal pressure and hard-shrinking the envelope about the electrodes feed adjacent the normally unsupported portion of the electrode on the side opposite the arc end to provide the cantilevered support; heating the envelope, electrodes, and coils of wire to the normal arc lamp operating temperature with a negative pressure inside the envelope to shrink the envelope without wetting about said coils of wire to provide electrode body support at the normal arc lamp operating temperature.
Claim 6
Dependent Claim
31 words
A method in accordance with claim 3 in which the step of shrinking the envelope about the electrode feed follows the step of shrinking the envelope about the coils of wire.
References Cited (Backward Citations)
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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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |