Patent US2790966A successfully refreshed from Google Patents.
US2790966A
Expired / Lapsed
US
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Magnetic recording and reproducing device
Assignee: National Research Development Corp UK
•
Filing: 1952-02-14
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Granted: 1957-04-30
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Expires: 1972-02-14
Abstract
No abstract record available.
Inventors
- 👤 Malbon Harry
- 👤 Fox George Warwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:04
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/004; G11B5/127; G11B5/1272; G11B5/265; G11B5/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2424633A
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US2435242A
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US2431540A
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US2591070A
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US2554582A
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US2584984A
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US2540654A
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US2617705A
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US2530584A
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US2621259A
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US2708693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |