US2445000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rate-based restricted service telephone system
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1942-06-18
•
Granted: 1948-07-13
•
Expires: 1962-06-18
Abstract
No abstract record available.
Inventors
- 👤 Ostline John Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:39
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/04; H04Q; H04Q3/00; H04Q3/0016; H04Q3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1238130A
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US1350882A
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US1468078A
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US1649494A
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US1646262A
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US1678185A
Cited
US2005595A
Cited
US2165924A
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US2289745A
Cited
US2272475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-13 | 1952-01-12 | 1952-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-13 | 1956-01-12 | 1956-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-13 | 1960-01-12 | 1960-07-13 | $7700.00 | Window Closed / Lapsed |