US2172453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio transmitter
Assignee: AT&T Inc
•
Filing: 1938-04-13
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Granted: 1939-09-12
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Expires: 1958-04-13
Abstract
No abstract record available.
Inventors
- 👤 Charles F P Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:35
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/36; H03C; H03C1/00; H03C1/02; H03C1/06
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) | 1942-09-11 | 1943-03-13 | 1943-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-09-11 | 1947-03-13 | 1947-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-09-11 | 1951-03-13 | 1951-09-12 | $7700.00 | Window Closed / Lapsed |