US2461456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency shift keying
Assignee: RCA Corp
•
Filing: 1944-02-11
•
Granted: 1949-02-08
•
Expires: 1964-02-11
Abstract
No abstract record available.
Inventors
- 👤 George L Usselman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:00
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US785803A
Cited
US1917312A
Cited
US1795393A
Cited
US2032403A
Cited
US2073409A
Cited
US2211750A
Cited
US2146862A
Cited
US2221115A
Cited
US2309764A
Cited
US2358610A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-02-08 | 1952-08-09 | 1953-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-08 | 1956-08-09 | 1957-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-08 | 1960-08-09 | 1961-02-08 | $7700.00 | Window Closed / Lapsed |