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US2612561A
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Half-duplex telegraph repeater
Assignee: AT&T Inc
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Filing: 1949-10-25
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Granted: 1952-09-30
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Expires: 1969-10-25
Abstract
No abstract record available.
Inventors
- 👤 Wilton T Rea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:12
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/14; H04L5/16; H04L25/00; H04L25/02; H04L25/20; H04L25/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2337886A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-30 | 1956-03-31 | 1956-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-30 | 1960-03-31 | 1960-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-30 | 1964-03-31 | 1964-09-30 | $7700.00 | Window Closed / Lapsed |