US2055575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telegraph repeater circuits
Assignee: AT&T Inc
•
Filing: 1934-07-05
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Granted: 1936-09-29
•
Expires: 1954-07-05
Abstract
No abstract record available.
Inventors
- 👤 Herman Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:45
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/42; H04L25/02; H04L25/20; H04L25/207; H04L5/00; H04L5/14; H04L5/18
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) | 1939-09-29 | 1940-03-30 | 1940-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-09-29 | 1944-03-30 | 1944-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-09-29 | 1948-03-30 | 1948-09-29 | $7700.00 | Window Closed / Lapsed |