Patent US5032128A successfully refreshed from Google Patents.
US3439331A
Expired / Lapsed
US
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Error detection and correction apparatus
Assignee: International Business Machines Corp
•
Filing: 1965-06-16
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Granted: 1969-04-15
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Expires: 1985-06-16
Abstract
No abstract record available.
Inventors
- 👤 David Trent Brown
- 👤 Charles Harry Wolff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:23
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1833; G11B20/1816
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2977047A
Cited
US3183483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |