Patent US3225255A successfully refreshed from Google Patents.
US3225255A
Expired / Lapsed
US
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Ballast apparatus
Assignee: General Electric Co
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Filing: 1962-04-09
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Granted: 1965-12-21
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Expires: 1982-04-09
Abstract
No abstract record available.
Inventors
- 👤 Roger E Hume
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:22
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; Y10S315/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A BALLAST APPARATUS FOR FLUORESCENT LAMPS COMPRISING A HIGH REACTANCE TRANSFORMER WITH A PRIMARY WINDING AND A SECONDARY WINDING INDUCTIVELY COUPLED ON A MAGNETIC CORE, SAID MAGNETIC CORE HAVING AT LEAST ONE BRIDGED SECTION UNDER THE SECONDARY WINDING, A FIRST OUTPUT LEAD AND CAPACITOR CONNECTED IN SERIES CIRCUIT WITH THE SECONDARY WINDING OF THE HIGH REACTANCE TRANSFORMER, A SECOND OUTPUT LEAD CONNECTED IN CIRCUIT WITH SAID HIGH REACTANCE TRANSFORMER SO THAT THE TRANSFORMER OUTPUT APPEARS AT SAID FIRST AND SECOND OUTPUT LEADS, AND A SHUNTING CIRCUIT CONNECTED IN PARALLEL CIRCUIT RELATION WITH THE SECONDARY WINDING OF SAID HIGH REACTANCE TRANSFORMER, SAID SHUNTING CIRCUIT INCLUDING A SHUNTING CAPACITOR DISCHARGING IN THE EARLY PORTION OF EACH HALF CYCLE OF THE LAMP CURRENT TO PROVIDE A CURRENT SPIKE SUFFICIENT IN MAGNITUDE TO AID REIGNITION OF A LAMP CONNECTED ACROSS SAID FIRST AND SECOND OUTPUT LEADS AND FURTHER INCLUDING AN INDUCTIVE IMPEDANCE ELEMENT CONNECTED IN SERIES CIRCUIT WITH THE SHUNTING CAPACITOR ACROSS SAID SECONDARY WINDING OF THE HIGH REACTANCE TRANSFORMER AND INDUCTIVELY ISOLATED FROM SAID HIGH REACTANCE TRANSFORMER.
Claim 2
Dependent Claim
174 words
A BALLAST APPARATUS FOR FLUORESCENT LAMPS COMPRISING A HIGH REACTANCE TRANSFORMER WITH A PRIMARY WINDING AND A SECONDARY WINDING INDUCTIVELY COUPLED ON A MAGNETIC CORE, SAID MAGNETIC CORE HAVING AT LEAST ONE BRIDGED SECTION UNDER THE SECONDARY WINDING, A FIRST OUTPUT LEAD AND CAPACITOR CONNECTED IN SERIES CIRCUIT WITH THE SECONDARY WINDING OF THE HIGH REACTANCE TRANSFORMER, A SECOND OUTPUT LEAD CONNECTED IN CIRCUIT WITH SAID HIGH REACTANCE TRANSFORMER SO THAT THE TRANSFORMER OUTPUT APPEARS AT SAID FIRST AND SECOND OUTPUT LEADS, AND A SHUNTING CIRCUIT CONNECTED IN PARALLEL CIRCUIT RELATION WITH THE SECONDARY WINDING OF SAID HIGH REACTANCE TRANSFORMER, SAID SHUNTING CIRCUIT INCLUDING A SHUNTING CAPACITOR DISCHARGING IN THE EARLY PORTION OF EACH HALF CYCLE OF THE LAMP CURRENT TO PROVIDE A CURRENT SPIKE SUFFICIENT IN MAGNITUDE TO AID REIGNITION OF A LAMP CONNECTED ACROSS SAID FIRST AND SECOND OUTPUT LEADS AND FURTHER INCLUDING AN INDUCTIVE IMPEDANCE ELEMENT CONNECTED IN SERIES CIRCUIT WITH THE SHUNTING CAPACITOR ACROSS SAID SECONDARY WINDING OF THE HIGH REACTANCE TRANSFORMER AND INDUCTIVELY ISOLATED FROM SAID HIGH REACTANCE TRANSFORMER.
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) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |