Patent US4043028A successfully refreshed from Google Patents.
Patent US2930998A successfully refreshed from Google Patents.
US2930998A
Expired / Lapsed
US
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Fluorescent lamp dimming ballast
Assignee: Ward Leonard Electric Co
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Filing: 1956-02-09
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Granted: 1960-03-29
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Expires: 1976-02-09
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Bastian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:41
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/08; H01F38/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR733427A
Cited
FR42343E
Cited
US2009787A
Cited
US2157834A
Cited
US2465596A
Cited
US2665406A
Cited
US2470460A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |