Patent US3548394A successfully refreshed from Google Patents.
US3548394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating magnetic disc storage structure
Assignee: Scientific Data Systems Inc
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Filing: 1968-02-26
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Granted: 1970-12-15
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Expires: 1988-02-26
Abstract
No abstract record available.
Inventors
- 👤 John A Felts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:58
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/0014; G11B23/0021; G11B23/0028; G11B23/0035; G11B17/00; G11B17/32; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005; G11B5/74; G11B5/82; G11B5/825
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |