US2501545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency modulation system
Assignee: RCA Corp
•
Filing: 1946-03-26
•
Granted: 1950-03-21
•
Expires: 1966-03-26
Abstract
No abstract record available.
Inventors
- 👤 Robert L Sproull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:01
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/30; H03C3/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2027975A
Cited
US2030125A
Cited
US2281935A
Cited
US2259690A
Cited
US2241976A
Cited
US2337214A
Cited
US2421725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |