US4757236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure metal halide arc lamp with xenon buffer gas
Assignee: General Electric Co
•
Filing: 1986-07-29
•
Granted: 1988-07-12
•
Expires: 2006-07-29
Abstract
Abstract High pressure xenon is used as a buffer gas in place of mercury in a high pressure sodium iodide arc discharge lamp. Xenon buffer gas has a more favorable influence than mercury on the sodium D-line spectrum and does not react with halides in the lamp fill. The use of xenon buffer gas increases the efficacy of the high pressure sodium iodide arc lamp.
Inventors
- 👤 James T. Dakin
- 👤 Peter D. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:29
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/82; H01J61/825; H01J61/02; H01J61/12; H01J61/125
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
In a high pressure metal halide arc lamp having an arc tube for containing an arc discharge, an arc tube fill substantially free of mercury and comprising: sodium iodide in a sufficient quantity to provide a sodium partial pressure in said arc discharge during lamp operation in the range of about 10 torr to about 100 torr; and xenon in a sufficient quantity to limit the chemical transport of energy from said arc discharge to the walls of said arc tube.
Claim 2
Dependent Claim
81 words
In a high pressure metal halide arc lamp having an arc tube for containing an arc discharge, an arc tube fill substantially free of mercury and comprising: sodium iodide in a sufficient quantity to provide a sodium partial pressure in said arc discharge during lamp operation in the range of about 10 torr to about 100 torr; and xenon in a sufficient quantity to limit the chemical transport of energy from said arc discharge to the walls of said arc tube.
Claim 3
Dependent Claim
14 words
The lamp of claim 1 wherein said fill further comprises a second metal halide.
Claim 4
Dependent Claim
26 words
The lamp of claim 1 wherein said quantity of xenon provides a partial pressure in the range of about 60 torr and higher at room temperature.
Claim 5
Dependent Claim
30 words
The lamp of claim 1 wherein said quantity of xenon provides a partial pressure in the range of about 600 torr and higher at the operating temperature of said lamp.
Claim 6
Dependent Claim
113 words
A high intensity arc discharge lamp comprising: an outer light transmissive envelope; a light transmission arc discharge tube situated within said envelope and having electrodes at opposite ends thereof, the interior of said tube being substantially free of mercury; means to provide electrical connection to said electrodes; sodium iodide disposed within said arc tube in a sufficient quantity to provide a sodium partial pressure in an arc discharge during lamp operation in the range of about 10 torr to about 100 torr; and xenon disposed within said arc tube in a quantity which provides xenon partial pressure in the range of about 600 torr and higher at the operating temperature of said lamp.
Claim 7
Dependent Claim
113 words
A high intensity arc discharge lamp comprising: an outer light transmissive envelope; a light transmission arc discharge tube situated within said envelope and having electrodes at opposite ends thereof, the interior of said tube being substantially free of mercury; means to provide electrical connection to said electrodes; sodium iodide disposed within said arc tube in a sufficient quantity to provide a sodium partial pressure in an arc discharge during lamp operation in the range of about 10 torr to about 100 torr; and xenon disposed within said arc tube in a quantity which provides xenon partial pressure in the range of about 600 torr and higher at the operating temperature of said lamp.
Claim 8
Dependent Claim
16 words
The lamp of claim 5 including a second metal halide also disposed within said arc tube.
References Cited (Backward Citations)
US3248590A
Cited
US3639801A
Cited
JPS5325085A
Cited
JPS5397278A
Cited
US4146813A
Cited
US4260929A
Cited
JPS5591560A
Cited
US4605881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |