US2725555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic frequency control
Assignee: AT&T Inc
•
Filing: 1948-07-16
•
Granted: 1955-11-29
•
Expires: 1968-07-16
Abstract
No abstract record available.
Inventors
- 👤 Andrew L Hopper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:04
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2211750A
Cited
US2434293A
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US2434294A
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US2469875A
Cited
US2425013A
Cited
US2475074A
Cited
US2437268A
Cited
US2445409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-28 | 1959-05-30 | 1959-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-28 | 1963-05-30 | 1963-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-28 | 1967-05-30 | 1967-11-29 | $7700.00 | Window Closed / Lapsed |