Patent US3304464A successfully refreshed from Google Patents.
US3304464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent lamp ballast and circuit
Assignee: Advance Transformer Co
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Filing: 1963-11-08
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Granted: 1967-02-14
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Expires: 1983-11-08
Abstract
No abstract record available.
Inventors
- 👤 Albert E Feinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:49
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/16; H05B41/20; H05B41/23; H05B41/232; H05B41/2325; Y; Y10; Y10S; Y10S315/00; Y10S315/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
224 words
A FLUORESCENT LIGHTING SYSTEM FOR A PAIR OF GASEOUS ARC DISCHARGE LAMPS ENERGIZED FROM AN A.C. SOURCE HAVING A HIGH POTENTIAL SIDE AND A GROUNDED SIDE AND IN WHICH EACH LAMP HAS A FILAMENT IN EACH END THEREOF WITH TWO EXTERNAL CONTACTS AT EACH END CONNECTED WITH A RESPECTIVE FILAMENT, WHICH COMPRISES: A TRANSFORMER HAVING A PRIMARY WINDING, A FIRST PAIR OF FILAMENT WINDINGS CLOSELY COUPLED TO THE PRIMARY WINDING WITH ONE END OF EACH BEING THE TERMINAL OF AN OUTPUT CIRCUIT INCLUDING ALL OF THE PRIMARY WINDING THEREIN, A SECOND PAIR OF FILAMENT WINDINGS CLOSELY COUPLED TO THE PRIMARY WINDING, A PAIR OF THREE-TERMINAL DISCONNECT LAMP SOCKETS HAVING TWO LAMP-RECEIVING TERMINALS AND A DISCONNECT TERMINAL WHICH MAKES ELECTRICAL ENGAGEMENT WITH ONE OF THE OTHER TWO TERMINALS BUT ONLY WHEN A LAMP IS INSERTED INTO THE SOCKET WITH ITS EXTERNAL CONTACTS ENGAGING THE LAMP TERMINALS AND IS TURNED TO A DETENT POSITION IN SAID LAST-MENTIONED SOCKET, A PAIR OF TWO-TERMINAL LAMP SOCKETS, THE FIRST PAIR OF FILAMENT WINDINGS BEING CONNECTED RESPECTIVELY TO THE LAMP-RECEIVING TERMINALS OF THE FIRST DISCONNECT SOCKET AND FIRST TWO-TERMINAL SOCKET, THE SECOND PAIR OF FILAMENT WINDINGS BEING CONNECTED RESPECTIVELY TO THE LAMP RECEIVING TERMINALS OF THE SECOND DISCONNECT SOCKET AND THE SECOND TWO-TERMINAL SOCKET, SO THAT EACH FILAMENT WINDING IS CONNECTED TO THE LAMP-RECEIVING TERMINALS OF A SINGLE SOCKET, THE
Claim 2
Dependent Claim
224 words
A FLUORESCENT LIGHTING SYSTEM FOR A PAIR OF GASEOUS ARC DISCHARGE LAMPS ENERGIZED FROM AN A.C. SOURCE HAVING A HIGH POTENTIAL SIDE AND A GROUNDED SIDE AND IN WHICH EACH LAMP HAS A FILAMENT IN EACH END THEREOF WITH TWO EXTERNAL CONTACTS AT EACH END CONNECTED WITH A RESPECTIVE FILAMENT, WHICH COMPRISES: A TRANSFORMER HAVING A PRIMARY WINDING, A FIRST PAIR OF FILAMENT WINDINGS CLOSELY COUPLED TO THE PRIMARY WINDING WITH ONE END OF EACH BEING THE TERMINAL OF AN OUTPUT CIRCUIT INCLUDING ALL OF THE PRIMARY WINDING THEREIN, A SECOND PAIR OF FILAMENT WINDINGS CLOSELY COUPLED TO THE PRIMARY WINDING, A PAIR OF THREE-TERMINAL DISCONNECT LAMP SOCKETS HAVING TWO LAMP-RECEIVING TERMINALS AND A DISCONNECT TERMINAL WHICH MAKES ELECTRICAL ENGAGEMENT WITH ONE OF THE OTHER TWO TERMINALS BUT ONLY WHEN A LAMP IS INSERTED INTO THE SOCKET WITH ITS EXTERNAL CONTACTS ENGAGING THE LAMP TERMINALS AND IS TURNED TO A DETENT POSITION IN SAID LAST-MENTIONED SOCKET, A PAIR OF TWO-TERMINAL LAMP SOCKETS, THE FIRST PAIR OF FILAMENT WINDINGS BEING CONNECTED RESPECTIVELY TO THE LAMP-RECEIVING TERMINALS OF THE FIRST DISCONNECT SOCKET AND FIRST TWO-TERMINAL SOCKET, THE SECOND PAIR OF FILAMENT WINDINGS BEING CONNECTED RESPECTIVELY TO THE LAMP RECEIVING TERMINALS OF THE SECOND DISCONNECT SOCKET AND THE SECOND TWO-TERMINAL SOCKET, SO THAT EACH FILAMENT WINDING IS CONNECTED TO THE LAMP-RECEIVING TERMINALS OF A SINGLE SOCKET, THE
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |