US3243651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ballast structure for fluorescent lamps
Assignee: Advance Transformer Co
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Filing: 1962-10-01
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Granted: 1966-03-29
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Expires: 1982-10-01
Abstract
No abstract record available.
Inventors
- 👤 Albert E Feinberg
- 👤 Berger Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:57
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/16; H05B41/20; H05B41/23; H05B41/232; H05B41/2325; H01; H01F; H01F38/00; H01F38/08; H01F38/10; H01F41/00; H01F41/02; H01F41/0206; H01F41/0233
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
110 words
A FLUORESCENT LAMP BALLAST FOR IGNITING AND OPERATINGG AT LEAST A PAIR OF LAMPS FROM AN ALTERNATING CURRENT SOURCE SAID LAMPS BEING CONNECTED IN SERIES, SAID BALLAST INCLUDING A TRANSFORMER HAVING A SHELL TYPE CORE FORMED OF A T-SHAPED CENTER LEG AND F-SHAPED SIDE LEGS, A PRIMARY WINDING AND A SECONDARY WINDING MOUNTED ON THE CENTER LEG AND SEPARATED BY A SHUNT, THE CENTER PROJECTIONS OF THE F-SHAPED PARTS EXTENDING TOWARD THE CENTER LEG TO PROVIDE SAID SHUNT AND BEING SLIGHTLY SPACED THEREFROM TO PROVIDE THE GAPS OF THE SHUNT, THE WINDINGS BEING CONNECTED IN AUTO-TRANSFORMER RELATION TO SAID LAMPS, A POWER FACTOR CORRECTING CONDENSER IN SERIES WITH THE SECONDARY
References Cited (Backward Citations)
US3114861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |