US3333150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-level ballast circuit including an isolation transformer for series circuit connection with a fluorescent lamp
Assignee: General Electric Co
•
Filing: 1964-09-30
•
Granted: 1967-07-25
•
Expires: 1984-09-30
Abstract
No abstract record available.
Inventors
- 👤 Franklin P Eppert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:03
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/40; H05B41/42; Y; Y10; Y10S; Y10S315/00; Y10S315/02; Y10S315/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A BALLAST CIRCUIT FOR VARYING THE OUTPUT LEVEL OF A HOT CATHODE FLUORESCENT LAMP ENERGIZED BY AN ALTERNATING CURRENT SOURCE, SAID CIRCUIT COMPRISING: (A) A FIRST TRANSFORMER HAVING A PRIMARY WINDING AND A PLURALITY OF SECONDARY WINDINGS, (B) A CAPACITOR CONNECTED TO SAID TRANSFORMER FOR CORRECTING THE POWER FACTOR OF SAID CIRCUIT, (C) MEANS FOR CONNECTING SAID SECONDARY WINDINGS TO HEAT THE CATHODES OF THE LAMP, (D) AN ISOLATION TRANSFORMER HAVING A PRIMARY AND A SECONDARY WINDING, (E) A REACTOR FOR LIMITING CURRENT TO THE LAMP DURING OPERATION, (F) MEANS FOR CONNECTING SAID ISOLATION TRANSFORMER PRIMARY WINDING AND SAID CURRENT LIMITING REACTOR IN SERIES BETWEEN THE LAMP AND THE SOURCE,
Claim 2
Dependent Claim
110 words
A BALLAST CIRCUIT FOR VARYING THE OUTPUT LEVEL OF A HOT CATHODE FLUORESCENT LAMP ENERGIZED BY AN ALTERNATING CURRENT SOURCE, SAID CIRCUIT COMPRISING: (A) A FIRST TRANSFORMER HAVING A PRIMARY WINDING AND A PLURALITY OF SECONDARY WINDINGS, (B) A CAPACITOR CONNECTED TO SAID TRANSFORMER FOR CORRECTING THE POWER FACTOR OF SAID CIRCUIT, (C) MEANS FOR CONNECTING SAID SECONDARY WINDINGS TO HEAT THE CATHODES OF THE LAMP, (D) AN ISOLATION TRANSFORMER HAVING A PRIMARY AND A SECONDARY WINDING, (E) A REACTOR FOR LIMITING CURRENT TO THE LAMP DURING OPERATION, (F) MEANS FOR CONNECTING SAID ISOLATION TRANSFORMER PRIMARY WINDING AND SAID CURRENT LIMITING REACTOR IN SERIES BETWEEN THE LAMP AND THE SOURCE,
References Cited (Backward Citations)
US1926423A
Cited
US2665394A
Cited
US2774917A
Cited
US2961579A
Cited
US3070743A
Cited
US3182249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-24 | 1971-01-23 | 1971-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-24 | 1975-01-23 | 1975-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-24 | 1979-01-23 | 1979-07-25 | $7700.00 | Window Closed / Lapsed |