Patent US2914619A successfully refreshed from Google Patents.
US2914619A
Expired / Lapsed
US
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Magnetic tape apparatus
Assignee: Ampex Corp
•
Filing: 1955-11-14
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Granted: 1959-11-24
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Expires: 1975-11-14
Abstract
No abstract record available.
Inventors
- 👤 John F Sweeney
- 👤 Donald E Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:15
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/20; G11B15/43
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1045905A
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US2591088A
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US2614215A
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US2609457A
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US2648589A
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US2713618A
Cited
US2778634A
Cited
US2814676A
Cited
US2751438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |