US4146819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for varying voltage in a high intensity discharge mercury lamp
Assignee: Union Carbide Chemicals and Plastics Technology LLC
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Filing: 1977-08-29
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Granted: 1979-03-27
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Expires: 1997-08-29
Abstract
Abstract A method for varying the voltage in a high intensity discharge mercury lamp comprising the following steps: (a) energizing the lamp at a substantially fixed current; (b) selecting a predetermined voltage; (c) sensing the lamp voltage; and (d) when the lamp voltage rises above the predetermined voltage, directing a pulsed flow of gas, which gas is at a temperature sufficient to condense the mercury, against the outer surface of the lamp intermediate of its electrodes at a pulse rate and pulse duration sufficient to achieve and maintain about the predetermined voltage.
Inventors
- 👤 Donald W. Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:15
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/39
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
A method for varying the voltage in a high intensity discharge mercury lamp comprising the following steps: (a) energizing the lamp at a substantially fixed current; (b) selecting a predetermined voltage; (c) sensing the lamp voltage; and (d) when the lamp voltage rises above the predetermined voltage, directing a pulsed flow of gas, which gas is at a temperature sufficient to condense the mercury, against the outer surface of the lamp intermediate of its electrodes at a pulse rate and pulse duration sufficient to achieve and maintain about the predetermined voltage.
Claim 2
Independent Claim
91 words
A method for varying the voltage in a high intensity discharge mercury lamp comprising the following steps: (a) energizing the lamp at a substantially fixed current; (b) selecting a predetermined voltage; (c) sensing the lamp voltage; and (d) when the lamp voltage rises above the predetermined voltage, directing a pulsed flow of gas, which gas is at a temperature sufficient to condense the mercury, against the outer surface of the lamp intermediate of its electrodes at a pulse rate and pulse duration sufficient to achieve and maintain about the predetermined voltage.
Claim 3
Dependent Claim
13 words
The process defined in claim 1 wherein the flow of gas is well-spread.
Claim 4
Dependent Claim
13 words
The process defined in claim 1 wherein the flow of gas is directed.
References Cited (Backward Citations)
US2080908A
Cited
US2279941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-26 | 1982-09-25 | 1983-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-26 | 1986-09-25 | 1987-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-26 | 1990-09-25 | 1991-03-27 | $7700.00 | Window Closed / Lapsed |