Patent US2954547A successfully refreshed from Google Patents.
US2954547A
Expired / Lapsed
US
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Selector for a multiple track record of a magnetic memory system
Assignee: International Business Machines Corp
•
Filing: 1956-02-16
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Granted: 1960-09-27
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Expires: 1976-02-16
Abstract
No abstract record available.
Inventors
- 👤 Howard E Singhaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:41
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/17; G11B5/29; G11B5/48; G11B5/488; G11B5/4886; G11B5/49; G11B5/4969; G11B5/54; G11B5/55; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055; Y10T29/4906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2352023A
Cited
US2416445A
Cited
US2539837A
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US2561476A
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US2645494A
Cited
US2751274A
Cited
US2831180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-27 | 1964-03-28 | 1964-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-27 | 1968-03-28 | 1968-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-27 | 1972-03-28 | 1972-09-27 | $7700.00 | Window Closed / Lapsed |