Patent US2488936A successfully refreshed from Google Patents.
US2488936A
Expired / Lapsed
US
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Frequency-modulation recording and reproducing and its combination with a radio receiver
Assignee: RCA Corp
•
Filing: 1940-12-12
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Granted: 1949-11-22
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Expires: 1960-12-12
Abstract
No abstract record available.
Inventors
- 👤 Walter Van B Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:07
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/02; G11B3/10; G11B3/34; G11B3/38; H; H03; H03D; H03D3/00; H04; H04R; H04R23/00; H04R3/00
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |