US2991455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic core logical devices
Assignee: International Business Machines Corp
•
Filing: 1955-08-25
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Granted: 1961-07-04
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Expires: 1975-08-25
Abstract
No abstract record available.
Inventors
- 👤 Edgar A Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:07
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/80; H03K17/82; G; G11; G11C; G11C11/00; G11C11/02; G11C11/08; H01; H01F; H01F3/00; H01F3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2430457A
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US2519426A
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US2741757A
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US2689328A
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US2700703A
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US2745908A
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US2742632A
Cited
US2803812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |