Patent US2928994A successfully refreshed from Google Patents.
US2928994A
Expired / Lapsed
US
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Transistor inverters for feeding fluorescent tubes
Assignee: Individual
•
Filing: 1957-10-22
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Granted: 1960-03-15
•
Expires: 1977-10-22
Abstract
No abstract record available.
Inventors
- 👤 Widakowich Marius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:38
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/26; H05B41/28; H05B41/282; H05B41/2821
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
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Cited
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Cited
US2816230A
Cited
US2837651A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |