US4388564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Energy saving fluorescent lamp circuit
Assignee: General Electric Co
•
Filing: 1981-03-09
•
Granted: 1983-06-14
•
Expires: 2001-03-09
Abstract
Abstract A fluorescent lamp ballast circuit comprising conductors for connection to an electrical power source, and an impedance such as a capacitor connected between one of the conductors and the power source. A positive temperature coefficient resistor may be provided in parallel with the aforesaid impedance.
Inventors
- 👤 Edward E. Hammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:05
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/16; H05B41/20; H05B41/23; H05B41/232; H05B41/2325; Y; Y10; Y10S; Y10S315/00; Y10S315/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A fluorescent lamp operating circuit comprising a ballast circuit enclosed in a housing and having conductors externally of the housing for connection to an electrical power source, wherein the improvement comprises a capacitor connected in series with one of said conductors externally of said housing, thereby reducing electrical power to the circuit, and a positive temperature coefficient resistor connected across said capacitor.
Claim 2
Dependent Claim
62 words
A fluorescent lamp operating circuit comprising a ballast circuit enclosed in a housing and having conductors externally of the housing for connection to an electrical power source, wherein the improvement comprises a capacitor connected in series with one of said conductors externally of said housing, thereby reducing electrical power to the circuit, and a positive temperature coefficient resistor connected across said capacitor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |