US3819982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low noise dimmer for fluorescent lamps
Assignee: General Electric Co
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Filing: 1972-11-30
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Granted: 1974-06-25
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Expires: 1992-11-30
Abstract
Abstract A phase control circuit for fluorescent lamps having low radio frequency noise signal generation characteristics which comprises a pair of control circuit terminals for connection into one power supply line of a pair for supply of conventional alternating current power.
Inventors
- 👤 F Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:36
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/39; H05B41/392; H05B41/3921; H05B41/3924; Y; Y10; Y10S; Y10S315/00; Y10S315/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
155 words
A phase control circuit for fluorescent lamps having low frequency noise signal generation characteristics, said phase control circuit comprising a first terminal, a second terminal and a common terminal, said first terminal and said common terminal providing an input for said phase control circuit, and said second terminal and said common terminal providing an output for said phase control circuit; a solid state switch and a coil in series connection between said first terminal and said second terminal; triggering means for supplying trigger signals to said solid state switch; a first high frequency signal path comprising a first capacitor in parallel with said series connected solid state switch and coil; a second high frequency signal path comprising a second capacitor between said first terminal and said common terminal; the capacitance of said first capacitor being between 0.047 microfarads and 0.15 microfarads, and the capacitance of said second capacitor being between 0.047 microfarads and 0.22 microfarads.
Claim 2
Dependent Claim
155 words
A phase control circuit for fluorescent lamps having low frequency noise signal generation characteristics, said phase control circuit comprising a first terminal, a second terminal and a common terminal, said first terminal and said common terminal providing an input for said phase control circuit, and said second terminal and said common terminal providing an output for said phase control circuit; a solid state switch and a coil in series connection between said first terminal and said second terminal; triggering means for supplying trigger signals to said solid state switch; a first high frequency signal path comprising a first capacitor in parallel with said series connected solid state switch and coil; a second high frequency signal path comprising a second capacitor between said first terminal and said common terminal; the capacitance of said first capacitor being between 0.047 microfarads and 0.15 microfarads, and the capacitance of said second capacitor being between 0.047 microfarads and 0.22 microfarads.
Claim 3
Dependent Claim
26 words
The circuit of claim 1 in which the capacitance of the first capacitor is 0.15 microfarads and the capacitance of the second capacitor is 0.1 microfarads.
Claim 4
Dependent Claim
23 words
The circuit of claim 1 in which the phase control circuit includes a variable resistor and a calibrating resistor in said triggering means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |