Patent US2819457A successfully refreshed from Google Patents.
US2819457A
Expired / Lapsed
US
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Timing and clocking circuits
Assignee: International Business Machines Corp
•
Filing: 1954-02-08
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Granted: 1958-01-07
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Expires: 1974-02-08
Abstract
No abstract record available.
Inventors
- 👤 Francis E Hamilton
- 👤 Jr Ernest S Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:43
CPC Classifications
G; G06; G06F; G06F1/00; G06F1/04; G11; G11B; G11B20/00; G11B20/10; G11B20/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2609439A
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US2680155A
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US2597428A
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US2614169A
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US2623108A
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US2685683A
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US2679638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |