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 08:37
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/38; H04M15/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1757446A
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US1863292A
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US1930612A
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US2004599A
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US2410520A
Cited
US2409063A
Cited
US2629016A
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US2535511A
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US2535509A
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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 |