US3867660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double chamber arc tube for high intensity discharge lamp
Assignee: GTE Sylvania Inc
•
Filing: 1973-08-13
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Granted: 1975-02-18
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Expires: 1993-08-13
Abstract
Abstract The arc tube of a high intensity arc discharge lamp has a double chamber section in order to increase lamp efficiency by improving the convective flow pattern within the arc tube during normal lamp operation.
Inventors
- 👤 Timothy Fohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:39
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/33; H01J61/04; H01J61/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
A high intensity arc discharge lamp comprising an elongated, double chamber arc tube, said arc tube containing an electricdischarge-supporting fill and having electrodes at its ends, the shape of the arc tube being such that during normal operation of the lamp in a position having a vertical component, upward convection flow of the gaseous and vaporized arc tube fill occurs within one chamber of the arc tube and downward convection flow occurs within the other chamber, the arc discharge being confined in said one chamber and being excluded from said other chamber.
Claim 2
Dependent Claim
92 words
A high intensity arc discharge lamp comprising an elongated, double chamber arc tube, said arc tube containing an electricdischarge-supporting fill and having electrodes at its ends, the shape of the arc tube being such that during normal operation of the lamp in a position having a vertical component, upward convection flow of the gaseous and vaporized arc tube fill occurs within one chamber of the arc tube and downward convection flow occurs within the other chamber, the arc discharge being confined in said one chamber and being excluded from said other chamber.
Claim 3
Dependent Claim
15 words
The lamp of claim 1 wherein said fill includes mercury and an inert starting gas.
Claim 4
Dependent Claim
17 words
The lamp of claim 1 wherein said fill includes mercury, metal halide and an inert starting gas.
Claim 5
Dependent Claim
21 words
The lamp of claim 1 wherein the double chamber of the arc tube is provided by a longitudinal baffle disposed therein.
Claim 6
Dependent Claim
37 words
The lamp of claim 1 wherein the double chamber of the arc tube is provided by an interior tube disposed therein, the length of said interior tube being less than the arc length of the arc tube.
Claim 7
Dependent Claim
29 words
The lamp of claim 1 wherein the double chamber is provided by a side tube spaced from but parallel to the arc tube and joined thereto at its ends.
Claim 8
Dependent Claim
101 words
A high intensity arc discharge lamp comprising an elongated, double chamber arc tube containing an electric-discharge-supporting fill and having electrodes at its ends, the shape of the arc tube being such that during normal operation of the lamp in a position having a vertical component, upward convection flow of the gaseous and vaporized arc tube fill occurs within one chamber of the arc tube while downward convection flow occurs within the other chamber and the arc tube is at a minimum predetermined cold spot temperature, the arc discharge being confined in said one chamber and being excluded from said other chamber.
Claim 9
Dependent Claim
101 words
A high intensity arc discharge lamp comprising an elongated, double chamber arc tube containing an electric-discharge-supporting fill and having electrodes at its ends, the shape of the arc tube being such that during normal operation of the lamp in a position having a vertical component, upward convection flow of the gaseous and vaporized arc tube fill occurs within one chamber of the arc tube while downward convection flow occurs within the other chamber and the arc tube is at a minimum predetermined cold spot temperature, the arc discharge being confined in said one chamber and being excluded from said other chamber.
Claim 10
Dependent Claim
23 words
The lamp of claim 7 wherein said fill includes mercury and said minimum cold spot temperature is sufficient to vaporize all the mercury.
Claim 11
Dependent Claim
27 words
The lamp of claim 8 wherein said fill also includes metal halide and said minimum cold spot is sufficient to vaporize an effective amount of metal halide.
References Cited (Backward Citations)
US1804349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |