US4004184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for operating gaseous discharge lamps on direct current from a source of alternating current
Assignee: John Ott Laboratories Inc
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Filing: 1975-06-06
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Granted: 1977-01-18
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Expires: 1995-06-06
Abstract
Abstract A system providing flickerless operation of a gaseous discharge lamp utilizes a DC voltage applied across the lamp electrodes. Low starting voltage and power consumption are obtained by applying an AC voltage across a grounded conductor member and adjacent lamp electrodes. This is a division of application Ser. No. 443,825, filed Feb. 19, 1974, now U.S. Pat. No. 3,890,540.
Inventors
- 👤 Henry Whitfield Ott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:28
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/16; H05B41/18; H05B41/19; Y; Y10; Y10S; Y10S315/00; Y10S315/05
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
155 words
Apparatus for operating a gaseous discharge lamp from an AC power source so as to provide flickerless operation of the lamp, said lamp having a pair of electrodes across which a voltage is applied to start and operate the lamp and a filament heater associated with at least one of said electrodes, said apparatus comprising: a. rectifier means having an input circuit connected to be energized by said AC power source and an output circuit connected to the lamp electrodes for operating the lamp on a DC current flowing between the electrodes, b. a heater circuit adapted to be energized from said AC power source for supplying heater current continuously during operation of the lamp to said heater independently of the current flowing between the lamp electrodes, and c. additional rectifying means for rectifying the current in the heater circuit whereby DC is supplied to said heater to prevent flicker of said lamp during operation.
Claim 2
Dependent Claim
155 words
Apparatus for operating a gaseous discharge lamp from an AC power source so as to provide flickerless operation of the lamp, said lamp having a pair of electrodes across which a voltage is applied to start and operate the lamp and a filament heater associated with at least one of said electrodes, said apparatus comprising: a. rectifier means having an input circuit connected to be energized by said AC power source and an output circuit connected to the lamp electrodes for operating the lamp on a DC current flowing between the electrodes, b. a heater circuit adapted to be energized from said AC power source for supplying heater current continuously during operation of the lamp to said heater independently of the current flowing between the lamp electrodes, and c. additional rectifying means for rectifying the current in the heater circuit whereby DC is supplied to said heater to prevent flicker of said lamp during operation.
Claim 3
Dependent Claim
29 words
The combination of claim 1 including heater supply transformer means adapted to be energized from said AC power source having secondary winding means connected to energize the heater circuit.
References Cited (Backward Citations)
SU187153A1
Cited
US2864035A
Cited
US3514667A
Cited
US3638070A
Cited
US3801867A
Cited
US3890540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |