Patent DE970248C successfully refreshed from Google Patents.
US2814031A
Expired / Lapsed
US
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Magnetic storage keyboard
Assignee: International Business Machines Corp
•
Filing: 1955-08-26
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Granted: 1957-11-19
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Expires: 1975-08-26
Abstract
No abstract record available.
Inventors
- 👤 Roderic A Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:02
CPC Classifications
G; G11; G11C; G11C17/00; G11C17/02; H; H03; H03K; H03K17/00; H03K17/94; H03K17/965; H03K17/97; H03K17/972
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2003329A
Cited
US2700703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |