US2838314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape apparatus
Assignee: Ampex Corp
•
Filing: 1952-10-20
•
Granted: 1958-06-10
•
Expires: 1972-10-20
Abstract
No abstract record available.
Inventors
- 👤 Walter T Selsted
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:53
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/26; G11B15/28; G11B15/295; G11B15/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2535486A
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US2530029A
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US2654809A
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US2698183A
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US2518556A
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US2620404A
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US2542590A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |