Patent US3521092A successfully refreshed from Google Patents.
US3521092A
Expired / Lapsed
US
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Data storage extended stroke actuator
Assignee: International Business Machines Corp
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Filing: 1968-07-10
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Granted: 1970-07-21
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Expires: 1988-07-10
Abstract
No abstract record available.
Inventors
- 👤 Clement H Kalthoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:17
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; H; H02; H02K; H02K41/00; H02K41/02; H02K41/035; H02K41/0352; H02K41/0354; H02K41/0356
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2810842A
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US3085847A
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US3130331A
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US3176170A
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US3260870A
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US3300744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |