US3746914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc discharge tube with surrounding starting coil
Assignee: GTE Sylvania Inc
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Filing: 1971-12-30
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Granted: 1973-07-17
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Expires: 1991-12-30
Abstract
Abstract A high pressure mercury-sodium lamp with an outer jacket and inner arc tube has several turns of tungsten resistance heating filament coiled around the arc tube. The filament is electrically connected to the leads which supply the arc tube electrodes and heats the mercury and sodium fill to arc striking temperature. At this temperature a bimetallic switch opens the filament connection.
Inventors
- 👤 A Olson
- 👤 W Gungle
- 👤 J Waymouth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:41
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/54; H01J61/541; H01J61/544
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
31 words
A high pressure arc discharge lamp according to claim 1 wherein the electrical heating means is effective to heat the arc tube to within the range of 150* to 400* centigrade.
Claim 2
Dependent Claim
24 words
A high pressure arc discharge lamp according to claim 1 wherein the alkali metal is selected from the group consisting of sodium and cesium.
Claim 3
Dependent Claim
24 words
A high pressure arc discharge lamp according to claim 1 wherein the rare gas is selected from the group consisting of argon and xenon.
Claim 4
Dependent Claim
11 words
A lamp according to claim 1 wherein the fill includes mercury.
Claim 5
Dependent Claim
24 words
A high pressure arc discharge lamp according to claim 3 wherein the rare gas is selected from the group consisting of argon and xenon.
Claim 6
Dependent Claim
31 words
A high pressure arc discharge lamp according to claim 1 wherein the heating means is a substantial light emitter, whereby the lamp provides illumination prior to full operation of the arc.
Claim 7
Dependent Claim
32 words
A high pressure arc discharge lamp according to claim 1 wherein the heating means is connected to an electrode by switching means responsive to arc starting condition to disconnect the heating means.
Claim 8
Dependent Claim
19 words
A high pressure arc discharge lamp according to claim 8 wherein the switching means is a thermal responsive device.
Claim 9
Dependent Claim
23 words
A high pressure arc discharge lamp according to claim 9 wherein the thermal device opens at a temperature between 150* and 400* centigrade.
Claim 10
Dependent Claim
53 words
A high pressure arc discharge lamp according to claim 1 wherein the heating means comprises an electrical conductor extending along a major portion of the length of the arc discharge space and in capacitative coupling relation thereto, and characterized by connections for applying voltage to the electrodes including a connection to the conductor.
Claim 11
Dependent Claim
22 words
A high pressure arc discharge lamp according to claim 11 wherein the conductor extends substantially the length of the arc discharge space.
Claim 12
Independent Claim
59 words
The method of starting a high pressure arc discharge lamp with an arc tube having spaced electrodes and fill including alkali metal and rare gas, which comprises applying a starting voltage to the electrodes and heating the arc tube to at least 150* centigrade by means of an electrical heater and electrically disconnecting the heater upon starting the lamp.
Claim 13
Dependent Claim
11 words
The method according to claim 13 wherein the fill includes mercury.
Claim 14
Dependent Claim
20 words
The method according to claim 13 wherein the alkali metal is selected from the group consisting of sodium and cesium.
Claim 15
Dependent Claim
20 words
The method according to claim 13 wherein the rare gas is selected from the group consisting of argon and xenon.
Claim 16
Dependent Claim
21 words
The method according to claim 16 wherein the arc tube is heated to within the range of 150* to 400* centigrade.
Claim 17
Dependent Claim
21 words
The method according to claim 17 wherein a voltage of less than approximately 400 volts peak is applied to the electrodes.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |