US2683240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamp circuits
Assignee: EMI Group Ltd
•
Filing: 1949-09-20
•
Granted: 1954-07-06
•
Expires: 1969-09-20
Abstract
No abstract record available.
Inventors
- 👤 Strange John William
- 👤 Waigh Douglas Thomas
- 👤 Bloxsidge William Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:29
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/39; H05B41/391
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1481876A
Cited
US1977231A
Cited
US2056661A
Cited
US2392845A
Cited
US2438564A
Cited
US2523021A
Cited
GB623199A
Cited
US2458277A
Cited
US2487092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-05 | 1958-01-04 | 1958-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-05 | 1962-01-04 | 1962-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-05 | 1966-01-04 | 1966-07-06 | $7700.00 | Window Closed / Lapsed |