Patent US4061939A successfully refreshed from Google Patents.
US4061939A
Expired / Lapsed
US
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Low noise sodium vapor lamp for sonic pulse operation
Assignee: General Electric Co
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Filing: 1976-08-02
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Granted: 1977-12-06
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Expires: 1996-08-02
Abstract
Abstract Jacketed high pressure sodium vapor lamps of conventional construction operated on sonic frequency pulses with short duty cycles in order to raise the color temperature produce excessive acoustic noise. The noise level is reduced by using non-magnetostrictive material for the inleads extending from the base into the outer envelope and including the portions embedded in the press of the stem, and for the frame parts that support the arc tube within the outer envelope.
Inventors
- 👤 Jack M. Strok, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:44
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/34; H01J61/36; H01J61/366
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
176 words
A jacketed high pressure sodium vapor lamp for operation at low noise levels on sonic pulses of short duty cycle comprising: an elongated light-transmitting ceramic arc tube having conductive electrode-supporting closures sealed to opposite ends and containing an ionizable filling including sodium, said electrodes and closures comprising only non-magnetostrictive material, an evacuated outer vitreous envelope surrounding said arc tube, said envelope having a vitreous stem at one end including a press through which extend a pair of inleads, all portions of said inleads including an intermediate portion sealed through the press, an inner portion passing into the outer envelope, and an outer portion being of non-magnetostrictive metal, a metal wire frame within said envelope for supporting and making electrical connections to said arc tube, said frame comprising a long side rod extending from the inner portion of one inlead to the other end of said envelope, and a short rod extending from the inner portion of the other inlead, both said rods being of non-magnetostrictive metal, and attachments between said arc tube closures and said rods.
Claim 2
Dependent Claim
176 words
A jacketed high pressure sodium vapor lamp for operation at low noise levels on sonic pulses of short duty cycle comprising: an elongated light-transmitting ceramic arc tube having conductive electrode-supporting closures sealed to opposite ends and containing an ionizable filling including sodium, said electrodes and closures comprising only non-magnetostrictive material, an evacuated outer vitreous envelope surrounding said arc tube, said envelope having a vitreous stem at one end including a press through which extend a pair of inleads, all portions of said inleads including an intermediate portion sealed through the press, an inner portion passing into the outer envelope, and an outer portion being of non-magnetostrictive metal, a metal wire frame within said envelope for supporting and making electrical connections to said arc tube, said frame comprising a long side rod extending from the inner portion of one inlead to the other end of said envelope, and a short rod extending from the inner portion of the other inlead, both said rods being of non-magnetostrictive metal, and attachments between said arc tube closures and said rods.
Claim 3
Dependent Claim
39 words
A lamp as in claim 1 wherein a base consisting entirely of non-magnetostrictive material is attached to the stem end of said outer envelope, and the outer portions of said inleads are connected to contact members in said base.
Claim 4
Dependent Claim
42 words
A lamp as in claim 1 wherein said inleads have an intermediate portion of tungsten embedded in the press of the stem and an outer portion of copper and an inner portion of titanium butt-welded to opposite ends of the intermediate portion.
Claim 5
Dependent Claim
17 words
A lamp as in claim 1 wherein the rods of said metal wire frame are of titanium.
Claim 6
Dependent Claim
45 words
A lamp as in claim 1 wherein the cathode electrode comprises a tungsten wire coil on a tungsten shank and an anti back-arcing shield mounted on the shank behind said coil, said shield being firmly attached in a manner precluding vibratory displacement on said shank.
Claim 7
Dependent Claim
22 words
A lamp as in claim 5 wherein said shield is a niobium disc which is centrally pierced and force-pressed on the shank.
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) | 1980-12-05 | 1981-06-06 | 1981-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-05 | 1985-06-06 | 1985-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-05 | 1989-06-06 | 1989-12-06 | $7700.00 | Window Closed / Lapsed |