Patent US3727102A successfully refreshed from Google Patents.
US4037129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure sodium vapor lamp having low starting voltage
Assignee: GTE Sylvania Inc
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Filing: 1976-03-10
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Granted: 1977-07-19
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Expires: 1996-03-10
Abstract
Abstract The alumina arc tube of a high pressure sodium arc discharge lamp has a multiple turn wire starting aid wound therearound in order to reduce lamp starting voltage. The starting aid must extend longitudinally along the arc tube for a distance that is at least 10% of the arc length of the arc tube.
Inventors
- 👤 Alexander T. Zack
- 👤 John J. Gutta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:21
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/54; H01J61/541; H01J61/544
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
74 words
In a high pressure arc discharge lamp comprising an arc tube disposed within an outer jacket, the arc tube having an electrode at each end, the improvement which comprises a multiple turn wire starting aid coiled around the arc tube intermediate the electrodes and electrically connected to only one of the electrodes, the coiled starting aid extending longitudinally along the arc tube a distance that is at least 10 % of the arc length.
Claim 2
Dependent Claim
74 words
In a high pressure arc discharge lamp comprising an arc tube disposed within an outer jacket, the arc tube having an electrode at each end, the improvement which comprises a multiple turn wire starting aid coiled around the arc tube intermediate the electrodes and electrically connected to only one of the electrodes, the coiled starting aid extending longitudinally along the arc tube a distance that is at least 10 % of the arc length.
Claim 3
Dependent Claim
16 words
The lamp of claim 1 wherein the starting aid is made of tungsten or molybdenum wire.
Claim 4
Dependent Claim
20 words
The lamp of claim 1 wherein the arc tube has a fill including sodium, mercury and a Penning gas mixture.
Claim 5
Dependent Claim
34 words
The lamp of claim 1 wherein the starting aid is connected to said electrode through a temperature activated switch which is normally closed at room temperature and which is open during normal lamp operation.
References Cited (Backward Citations)
US3721845A
Cited
US3900753A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |