Patent US2478977A successfully refreshed from Google Patents.
US2478977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal seeking receiver for frequency modulated signals
Assignee: COLONIAL RADIO Corp
•
Filing: 1944-11-13
•
Granted: 1949-08-16
•
Expires: 1964-11-13
Abstract
No abstract record available.
Inventors
- 👤 Jr Madison G Nicholson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:39
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/18; H03J7/30
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1780669A
Cited
US1700282A
Cited
GB306865A
Cited
US2011953A
Cited
US2113436A
Cited
US2173154A
Cited
US2056200A
Cited
US2150265A
Cited
US2152336A
Cited
US2174566A
Cited
US2369542A
Cited
US2250532A
Cited
US2277581A
Cited
US2280019A
Cited
US2251064A
Cited
US2320996A
Cited
US2279506A
Cited
US2282910A
Cited
US2349881A
Cited
US2358454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-15 | 1953-02-14 | 1953-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-15 | 1957-02-14 | 1957-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-15 | 1961-02-14 | 1961-08-16 | $7700.00 | Window Closed / Lapsed |