Patent US2543177A successfully refreshed from Google Patents.
US2901549A
Expired / Lapsed
US
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Magnetic recording system
Assignee: RCA Corp
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Filing: 1953-05-29
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Granted: 1959-08-25
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Expires: 1973-05-29
Abstract
No abstract record available.
Inventors
- 👤 Serrell Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:39
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/49; G11B5/4907; G11B15/00; G11B15/02; G11B15/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2517808A
Cited
US2608621A
Cited
US2700703A
Cited
US2722569A
Cited
US2830130A
Cited
US2804506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |