US3686042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semihard magnetic material
Assignee: Fujitsu Ltd
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Filing: 1971-01-04
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Granted: 1972-08-22
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Expires: 1991-01-04
Abstract
Abstract THIS INVETION PROVIDES A SEMIHARD MAGNETIC MATERIAL HAVING A COERCIVE FORCE OF 10-15 OE. (OERSTED) AND IN WHICH THE RATIO BETWEEN REMANENCE AND SATURATION MAGNETIZATION (HEREAFTER REFERRED TO AS THE SQUARENESS RATIO) IS NEAR 1 AND WHICH CAN BE USED IN A SEMI-PERMANENT MEMORY DEVICE SUCH AS AN ELECTROLESS EXCHANGE OR AN ELECTRONIC COMPUTER. THE INVENTION RELATES TO A SEMIHARD MAGNETIC MATERIAL OF A NEW COMPOSITION. THE COMPOSITION INCLUDES 78-95% CO, 0.2-3% BE, A SMALLE AMOUNT OF DEOXIDIZER AND FE AS THE LAST CONSTITUENT. THE COERCIVE FORCE IS MADE 10-50 OE. BY AN APPROPRIATE HEAT TREATMENT AND WORKING PROCESS.
Inventors
- 👤 Zenzo Henmi
- 👤 Tatsuji Sasaki
- 👤 Yuji Matsui
- 👤 Harumi Maegawa
- 👤 Yoshihiro Sato
- 👤 Tsuneyasu Gotoh
- 👤 Masahiro Komatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:03
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |