Patent US3474427A successfully refreshed from Google Patents.
US3474427A
Expired / Lapsed
US
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Data storage system
Assignee: XEBEC
•
Filing: 1964-11-23
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Granted: 1969-10-21
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Expires: 1984-11-23
Abstract
No abstract record available.
Inventors
- 👤 William Ward Stevens Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:53
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2622155A
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US2850720A
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US2890288A
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US2903677A
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US3156906A
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US3229269A
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US3195118A
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US3185972A
Cited
US3196420A
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US3263031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |