US2854655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical signalling systems
Assignee: British Telecommunications PLC
•
Filing: 1953-05-26
•
Granted: 1958-09-30
•
Expires: 1973-05-26
Abstract
No abstract record available.
Inventors
- 👤 Beaufoy Raymond
- 👤 Baker George Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:18
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2554886A
Cited
US2587532A
Cited
US2570716A
Cited
US2575342A
Cited
US2729803A
Cited
US2698875A
Cited
US2614169A
Cited
US2592737A
Cited
US2714843A
Cited
US2611025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |