Patent US1548039A successfully refreshed from Google Patents.
US1548039A
Expired / Lapsed
US
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Two-way repeater
Assignee: AT&T Inc
•
Filing: 1923-06-29
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Granted: 1925-08-04
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Expires: 1943-06-29
Abstract
No abstract record available.
Inventors
- 👤 Jacob S Jammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:11
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/62; H03F3/64
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) | 1928-08-03 | 1929-02-02 | 1929-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-08-03 | 1933-02-02 | 1933-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-08-03 | 1937-02-02 | 1937-08-04 | $7700.00 | Window Closed / Lapsed |