US2969200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape apparatus
Assignee: Ampex Corp
•
Filing: 1955-07-18
•
Granted: 1961-01-24
•
Expires: 1975-07-18
Abstract
No abstract record available.
Inventors
- 👤 Walter T Selsted
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:56
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/43
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1862267A
Cited
US1937077A
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US2365691A
Cited
US2469706A
Cited
US2467507A
Cited
GB704798A
Cited
US2855160A
Cited
US2769932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-24 | 1964-07-25 | 1965-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-24 | 1968-07-25 | 1969-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-24 | 1972-07-25 | 1973-01-24 | $7700.00 | Window Closed / Lapsed |