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US2875283A
Expired / Lapsed
US
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Equivalent four-wire repeaters
Assignee: AT&T Inc
•
Filing: 1956-12-28
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Granted: 1959-02-24
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Expires: 1976-12-28
Abstract
No abstract record available.
Inventors
- 👤 Theodore L Maione
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:24
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/36; H04B3/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2531419A
Cited
US2561212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |