Patent US4808379A successfully refreshed from Google Patents.
US2557012A
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Magnetic phonograph and reeling system therefor
Assignee: RCA Corp
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Filing: 1945-11-13
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Granted: 1951-06-12
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Expires: 1965-11-13
Abstract
No abstract record available.
Inventors
- 👤 Terry M Shrader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:23
CPC Classifications
G; G06; G06M; G06M1/00; G06M1/04; G06M1/06; G06M1/064
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1718355A
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US2096445A
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US2275961A
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US2160495A
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US2306660A
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US2372810A
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US2455187A
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US2428002A
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US2457699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |