Patent US2740836A successfully refreshed from Google Patents.
US2740836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toll ticketing telephone systems
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1951-01-11
•
Granted: 1956-04-03
•
Expires: 1971-01-11
Abstract
No abstract record available.
Inventors
- 👤 John E Ostline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:44
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/38; H04M15/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1613613A
Cited
US1757446A
Cited
US1863292A
Cited
US1930612A
Cited
US2004599A
Cited
US2410520A
Cited
US2409063A
Cited
US2629016A
Cited
US2535511A
Cited
US2535509A
Cited
US2405214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |