US2557809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for operating electric discharge lamps
Assignee: The General Electric Company PLC
•
Filing: 1948-08-05
•
Granted: 1951-06-19
•
Expires: 1968-08-05
Abstract
No abstract record available.
Inventors
- 👤 Willoughby Anthony Haydn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:52
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/02; H05B41/04; H05B41/10; Y; Y10; Y10S; Y10S315/00; Y10S315/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1961749A
Cited
US1984489A
Cited
US2103030A
Cited
US2181294A
Cited
US2291355A
Cited
US2309711A
Cited
US2399557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |