US2422140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency modulated recording and reproducing system
Assignee: RCA Corp
•
Filing: 1943-05-15
•
Granted: 1947-06-10
•
Expires: 1963-05-15
Abstract
No abstract record available.
Inventors
- 👤 Chester M Sinnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:35
CPC Classifications
G; G11; G11B; G11B9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US200521A
Cited
US578386A
Cited
DE330990C
Cited
DE336015C
Cited
US1580112A
Cited
US2304633A
Cited
US2322621A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-09 | 1950-12-09 | 1951-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-09 | 1954-12-09 | 1955-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-09 | 1958-12-09 | 1959-06-10 | $7700.00 | Window Closed / Lapsed |