US2748197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone systems
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1952-01-14
•
Granted: 1956-05-29
•
Expires: 1972-01-14
Abstract
No abstract record available.
Inventors
- 👤 John E Ostline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:19
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2426981A
Cited
US2447533A
Cited
US2629016A
Cited
US2535511A
Cited
US2522000A
Cited
US2657271A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-29 | 1959-11-28 | 1960-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-29 | 1963-11-28 | 1964-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-29 | 1967-11-28 | 1968-05-29 | $7700.00 | Window Closed / Lapsed |