US2492136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic telephone exchange
Assignee: Federal Telecommunication Laboratories Inc
•
Filing: 1946-03-14
•
Granted: 1949-12-27
•
Expires: 1966-03-14
Abstract
No abstract record available.
Inventors
- 👤 Edmond M Deloraine
- 👤 David H Ransom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:42
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/526; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2185693A
Cited
US2265216A
Cited
US2263369A
Cited
US2387018A
Cited
US2379221A
Cited
US2379715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |