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Patent US2133456A successfully refreshed from Google Patents.
US2133456A
Expired / Lapsed
US
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Regenerative telegraph repeater
Assignee: AT&T Inc
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Filing: 1936-02-15
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Granted: 1938-10-18
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Expires: 1956-02-15
Abstract
No abstract record available.
Inventors
- 👤 Fullerton S Kinkead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:43
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/20; H04L25/205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-10-17 | 1942-04-18 | 1942-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-10-17 | 1946-04-18 | 1946-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-10-17 | 1950-04-18 | 1950-10-18 | $7700.00 | Window Closed / Lapsed |