US4171978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron/chromium/cobalt-base spinodal decomposition-type magnetic (hard or semi-hard) alloy
Assignee: Japan Kinoko Research Center Foundation
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Filing: 1977-02-11
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Granted: 1979-10-23
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Expires: 1997-02-11
Abstract
Abstract A spinodal decomposition type magnetic alloy which contains, in addition to 3 to 30% by weight cobalt, 10 to 40% by weight chromium, and iron, a quantity of 0.1 to 15% by weight vanadium, preferably 0.5 to 10% by weight vanadium. A body made from this alloy has excellent magnetic properties and excellent cold workability.
Inventors
- 👤 Kiyoshi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:07
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/30; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
34 words
A spinodal decomposition type magnetic alloy consisting by weight essentially of 3 to 30% cobalt, 10 to 40% chromium, 0.1 to 15% vanadium and the balance iron and being capable of undergoing spinodal decomposition.
Claim 2
Dependent Claim
34 words
A spinodal decomposition type magnetic alloy consisting by weight essentially of 3 to 30% cobalt, 10 to 40% chromium, 0.1 to 15% vanadium and the balance iron and being capable of undergoing spinodal decomposition.
Claim 3
Dependent Claim
14 words
The alloy defined in claim 1 which contains 0.5 to 10% by weight vanadium.
Claim 4
Dependent Claim
14 words
The alloy defined in claim 1 which contains 5 to 25% by weight cobalt.
Claim 5
Dependent Claim
14 words
The alloy defined in claim 1 which contains 15 to 35% by weight chromium.
Claim 6
Dependent Claim
21 words
The alloy defined in claim 1 which contains 5 to 25% by weight cobalt and 15 to 35% by weight chromium.
Claim 7
Dependent Claim
12 words
The alloy defined in claim 5 which contains 0.5 to 10% vanadium.
References Cited (Backward Citations)
US3600162A
Cited
US3588764A
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US3806336A
Cited
JPS50101217A
Cited
US3986867A
Cited
US3954519A
Cited
JPS515612A
Cited
US4008105A
Cited
US4093477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-22 | 1983-04-23 | 1983-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-22 | 1987-04-23 | 1987-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-22 | 1991-04-23 | 1991-10-23 | $7700.00 | Window Closed / Lapsed |