Patent US3409746A successfully refreshed from Google Patents.
US3409746A
Expired / Lapsed
US
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Magnetic disc recording and reproducing machine
Assignee: Ampex Corp
•
Filing: 1964-04-02
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Granted: 1968-11-05
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Expires: 1984-04-02
Abstract
No abstract record available.
Inventors
- 👤 Erling P Skov
- 👤 Charles A Vogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:06
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/04; G11B17/05; G11B17/051; G11B17/021; G11B17/022; G11B17/028; G11B17/0284; G11B19/00; G11B19/02; G11B19/022; G11B19/12; G11B19/16; G11B19/20; G11B20/00; G11B20/20; G11B25/00; G11B25/04; G11B25/043; G11B27/00; G11B27/002; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3018; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/781; G11B2220/00; G11B2220/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US893277A
Cited
US3074724A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |