Patent US3417384A successfully refreshed from Google Patents.
US3417384A
Expired / Lapsed
US
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Magnetic memory
Assignee: Bell and Howell Co
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Filing: 1964-07-20
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Granted: 1968-12-17
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Expires: 1984-07-20
Abstract
No abstract record available.
Inventors
- 👤 Donald E Blahut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:00
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/06085; H; H03; H03K; H03K17/00; H03K17/51; H03K17/80; H03K17/81; H03K17/84
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-17 | 1972-06-17 | 1972-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-17 | 1976-06-17 | 1976-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-17 | 1980-06-17 | 1980-12-17 | $7700.00 | Window Closed / Lapsed |