Patent US2667604A successfully refreshed from Google Patents.
US2667604A
Expired / Lapsed
US
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Starting and operating circuits for fluorescent lamps
Assignee: Individual
•
Filing: 1948-08-24
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Granted: 1954-01-26
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Expires: 1968-08-24
Abstract
No abstract record available.
Inventors
- 👤 William S H Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:06
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/02; H05B41/04; H05B41/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1951294A
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US1961749A
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US1984489A
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US2181294A
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US2291355A
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US2438557A
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US2341520A
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US2305385A
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US2465059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |