US3020359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape transducing apparatus
Assignee: Ampex Corp
•
Filing: 1957-10-11
•
Granted: 1962-02-06
•
Expires: 1977-10-11
Abstract
No abstract record available.
Inventors
- 👤 Pfost Robert Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:53
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/61; G11B5/00; G11B5/48; G11B5/52; G11B5/53
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2735901A
Cited
US1409439A
Cited
US2291687A
Cited
US2493742A
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US2530584A
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CH276766A
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US2813924A
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US2647755A
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US2750449A
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GB737323A
Cited
US2862064A
Cited
US2751438A
Cited
US2862067A
Cited
US2892901A
Cited
US2897290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |