Patent FR2580504A1 successfully refreshed from Google Patents.
US2770797A
Expired / Lapsed
US
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Data storage apparatus
Assignee: International Business Machines Corp
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Filing: 1951-12-31
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Granted: 1956-11-13
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Expires: 1971-12-31
Abstract
No abstract record available.
Inventors
- 👤 Francis E Hamilton
- 👤 George V Hawkins
- 👤 Jr Robert E Lawhead
- 👤 Jr Ernest S Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:53
CPC Classifications
G; G06; G06C; G06C25/00; G11; G11B; G11B5/00; G11B5/004
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) | 1959-11-13 | 1960-05-14 | 1960-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-13 | 1964-05-14 | 1964-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-13 | 1968-05-14 | 1968-11-13 | $7700.00 | Window Closed / Lapsed |