Patent US2606329A successfully refreshed from Google Patents.
Patent US2855506A successfully refreshed from Google Patents.
US2855506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic frequency control circuit for frequency shift radio telegraphy
Assignee: Mackay Radio & Telegraph Co
•
Filing: 1956-02-29
•
Granted: 1958-10-07
•
Expires: 1976-02-29
Abstract
No abstract record available.
Inventors
- 👤 Fritz M Schabauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:57
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/16
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |