Patent US2497534A successfully refreshed from Google Patents.
US2497534A
Expired / Lapsed
US
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Circuits for high-frequency operation of fluorescent lamps
Assignee: General Electric Co
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Filing: 1947-09-13
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Granted: 1950-02-14
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Expires: 1967-09-13
Abstract
No abstract record available.
Inventors
- 👤 John H Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:15
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/16; H05B41/20; H05B41/23; H05B41/232; H05B41/24; H05B41/245; Y; Y10; Y10S; Y10S315/00; Y10S315/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2056629A
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US2050135A
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US2086668A
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US2133494A
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US2170447A
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US2284407A
Cited
US2301671A
Cited
US2368090A
Cited
US2423031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |