Patent US3380919A successfully refreshed from Google Patents.
US3380919A
Expired / Lapsed
US
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Preparation of ferromagnetic nimno
Assignee: Ampex Corp
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Filing: 1964-02-06
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Granted: 1968-04-30
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Expires: 1984-02-06
Abstract
No abstract record available.
Inventors
- 👤 Donald G Wickham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:59
CPC Classifications
C; C01; C01G; C01G53/00; C01G53/40; C01G53/42; C01G53/44; C01G53/56; C04; C04B; C04B35/00; C04B35/01; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/0302; H01F1/0311; H01F1/0313; H01F1/0317; H01F1/032; H01F1/10; H01F1/11; C01P; C01P2006/00; C01P2006/42
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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |