US2777971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information storage means
Assignee: International Business Machines Corp
•
Filing: 1949-05-16
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Granted: 1957-01-15
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Expires: 1969-05-16
Abstract
No abstract record available.
Inventors
- 👤 Williams Frederick Calland
- 👤 Kilburn Tom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:06
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/02; G; G11; G11C; G11C11/00; G11C11/21; G11C11/23; H01; H01J; H01J31/00; H01J31/08; H01J31/58; H01J31/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2454410A
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US2469031A
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US2474040A
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US2576040A
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US2564908A
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US2656485A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |