US3574003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating semi-hard magnetic alloys
Assignee: NTT Inc
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Filing: 1967-10-09
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Granted: 1971-04-06
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Expires: 1987-10-09
Abstract
Abstract SEMI-HARD MAGNETIC ALLOY OF A COMPOSITION CONSISTING OF 1 TO 20%, BY WEIGHT, OF NI, 0.5 TO 4.5%, BY WEIGHT OF A1, 0.5 TO 3%, BY WEIGHT, OF TI, 0.01 TO 5%, BY WEIGHT, OF CU, IF DESIRED, AND THE REST OF FE. THE ALLOY IS HEATED TO A TEMPERATURE RANGING FROM 300*C. TO 900*C, COOLED TO A TEMPERATURE BELOW 300*C., AND THEN COLD ROLLED AT A REDUCTION RATE OF FROM 10 TO 70% TO FURTHER IMPROVE ITS MAGNETIC CHARACTERISTICS.
Inventors
- 👤 Tomisaburo Nara
- 👤 Yukio Kiyotani
- 👤 Mutsuo Tokuyoshi
- 👤 Huzio Hirabayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:01
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/08
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |