Patent US2343554A successfully refreshed from Google Patents.
Patent US2697801A successfully refreshed from Google Patents.
US2697801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instant starting circuit for fluorescent lamps
Assignee: Individual
•
Filing: 1953-09-30
•
Granted: 1954-12-21
•
Expires: 1973-09-30
Abstract
No abstract record available.
Inventors
- 👤 William S H Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:43
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/02; H05B41/04; H05B41/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1951294A
Cited
US1961749A
Cited
US1984489A
Cited
US2181294A
Cited
US2291355A
Cited
US2438557A
Cited
US2341520A
Cited
US2305385A
Cited
US2465059A
Cited
US2667604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |