US3755708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sodium vapor lamps having improved starting means
Assignee: GTE Sylvania Inc
•
Filing: 1972-06-02
•
Granted: 1973-08-28
•
Expires: 1992-06-02
Abstract
Abstract The arc tube of a sodium vapor arc discharge lamp has an external electrical heater spaced from but in heat transfer relationship therewith. The heater is made of tungsten wire and is coiled around an insulating supporting rod.
Inventors
- 👤 E Audesse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:38
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/52
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
12 words
The lamp of claim 1 wherein said heater comprises a coiled coil.
Claim 2
Dependent Claim
13 words
The lamp of claim 1 wherein said insulating rod is made of alumina.
Claim 3
Dependent Claim
25 words
The lamp of claim 1 wherein the diameter of said insulating rod is less than about 40 percent of the diameter of said arc tube.
Claim 4
Dependent Claim
37 words
The lamp of claim 1 wherein said switch is normally closed and where the opening temperature of said switch is such that upon electrical energization of said lamp, said switch opens in about 3 or 4 minutes.
Claim 5
Dependent Claim
50 words
The lamp of claim 1 wherein the construction and spacing of said heater is such that, upon normal operation of said lamp, said heater heats said arc tube sufficiently that a starting voltage of less than about 400 volts ignites an arc discharge between the electrodes of said arc tube.
References Cited (Backward Citations)
US2765416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |