US1403841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency-control system
Assignee: AT&T Inc
•
Filing: 1919-09-30
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Granted: 1922-01-17
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Expires: 1939-09-30
Abstract
No abstract record available.
Inventors
- 👤 John R Carson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:43
CPC Classifications
H; H03; H03B; H03B21/00; H03B21/01; H03B21/02
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) | 1925-01-16 | 1925-07-18 | 1926-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-01-16 | 1929-07-18 | 1930-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-01-16 | 1933-07-18 | 1934-01-17 | $7700.00 | Window Closed / Lapsed |