Patent US2689315A successfully refreshed from Google Patents.
US2689315A
Expired / Lapsed
US
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Preheat neutralizing circuit for fluorescent lamps
Assignee: General Electric Co
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Filing: 1949-11-23
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Granted: 1954-09-14
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Expires: 1969-11-23
Abstract
No abstract record available.
Inventors
- 👤 Lemmers Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:42
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/16; H05B41/20; H05B41/23; H05B41/232; H05B41/2325
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1980534A
Cited
US2025471A
Cited
US2231584A
Cited
US2256242A
Cited
US2504548A
Cited
US2444408A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |