US3391397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin magnetic film storage apparatus having adjustable inductive coupling devices
Assignee: EMI Ltd
•
Filing: 1964-07-14
•
Granted: 1968-07-02
•
Expires: 1984-07-14
Abstract
No abstract record available.
Inventors
- 👤 Birt David Edward
- 👤 Sivyer Raymond Frank
- 👤 Webley Reginald Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:46
CPC Classifications
G; G11; G11C; G11C7/00; G11C7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2900624A
Cited
US3000004A
Cited
US3055770A
Cited
US3142049A
Cited
US3298005A
Cited
US3181131A
Cited
US3181132A
Cited
US3325793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |