US2998495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording and reproducing high frequencies transversely on a magnetic tape
Assignee: Ampex Corp
•
Filing: 1958-03-26
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Granted: 1961-08-29
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Expires: 1978-03-26
Abstract
No abstract record available.
Inventors
- 👤 Maxey Alexander Rainey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:05
CPC Classifications
B; B61; B61K; B61K9/00; B61K9/08; G; G05; G05D; G05D13/00; G05D13/62; G11; G11B; G11B15/00; G11B15/60; G11B15/61; G11B15/615; G11B5/00; G11B5/48; G11B5/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1707243A
Cited
US2314834A
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US2773120A
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US2612566A
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DE877210C
Cited
US2747025A
Cited
US2919314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |