Patent US2617890A successfully refreshed from Google Patents.
US2617890A
Expired / Lapsed
US
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Erasing magnet assembly for magnetic recording and reproducing instruments
Assignee: AMPRO CORP
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Filing: 1950-11-09
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Granted: 1952-11-11
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Expires: 1970-11-09
Abstract
No abstract record available.
Inventors
- 👤 Barany Edmund
- 👤 Sackter Melvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:23
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/325
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2535486A
Cited
FR942645A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |