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Patent US2751436A successfully refreshed from Google Patents.
US2751436A
Expired / Lapsed
US
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Carrier current telephone systems
Assignee: Automatic Electric Laboratories Inc
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Filing: 1952-03-27
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Granted: 1956-06-19
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Expires: 1972-03-27
Abstract
No abstract record available.
Inventors
- 👤 Bakker Pier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:18
CPC Classifications
H; H04; H04M; H04M7/00; H04M7/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2414440A
Cited
US2559165A
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US2535446A
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US2590746A
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US2590672A
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US2691068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-19 | 1959-12-19 | 1960-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-19 | 1963-12-19 | 1964-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-19 | 1967-12-19 | 1968-06-19 | $7700.00 | Window Closed / Lapsed |