US4008105A
Expired / Lapsed
US
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Magnetic materials
Assignee: Warabi Special Steel Co Ltd
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Filing: 1975-04-22
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Granted: 1977-02-15
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Expires: 1995-04-22
Abstract
Abstract In magnet alloy of spinodal decomposition type comprising Fe-Cr-Co or Fe-Cr-Co-Si system, magnetic materials containing Zr in an amount from 0.03 to 3.5%. Such magnetic materials are embodied by containing Zr in an amount from 0.03 to 3.5% by weight in an alloy system comprising Co from 10 to 35% and Cr from 25 to 40%, the balance being Fe or in an alloy system comprising Co from 10 to 35%, Cr from 25 to 40% and Si from 0.3 to 2.0%, the balance being Fe.
Inventors
- 👤 Sumio Yuda
- 👤 Tohru Sawada
- 👤 Kohji Moriya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:31
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: 6
Claim 1
Independent Claim
99 words
A ductile permanent magnetic composition exhibiting a residual flux density greater than 10,100 gauss and a coercive force greater than 540 that can be cold drawn from a specimen diameter of 10 mm through a die having a diameter of less than 9.8 mm without breaking and is characterized by small grain structure in the α phase when cooled in water in the order of 20° C. which composition consists essentially of 0.03 to 3.5% by weight of zirconium, 10 to 35% by weight cobalt, 25 to 40% by weight chromium and the balance being iron and incidental impurities.
Claim 2
Dependent Claim
99 words
A ductile permanent magnetic composition exhibiting a residual flux density greater than 10,100 gauss and a coercive force greater than 540 that can be cold drawn from a specimen diameter of 10 mm through a die having a diameter of less than 9.8 mm without breaking and is characterized by small grain structure in the α phase when cooled in water in the order of 20° C. which composition consists essentially of 0.03 to 3.5% by weight of zirconium, 10 to 35% by weight cobalt, 25 to 40% by weight chromium and the balance being iron and incidental impurities.
Claim 3
Dependent Claim
14 words
The magnetic composition of claim 1 including therein 0.3 to 2.0% by weight silicon.
Claim 4
Dependent Claim
44 words
The magnetic composition of claim 1 wherein cobalt is present in an amount from 21 to 24% by weight, chromium is present in an amount from 27 to 28% by weight, and zirconium is present in an amount from 0.4 to 0.6% by weight.
Claim 5
Dependent Claim
56 words
The magnetic composition of claim 2 wherein cobalt is present in an amount from 21 to 24% by weight, chromium is present in an amount from 27 to 31% by weight, silicon is present in an amount from 0.9 to 1.1% by weight, and zirconium is present in an amount from 0.4 to 0.6% by weight.
Claim 6
Dependent Claim
56 words
The magnetic composition of claim 2 wherein cobalt is present in an amount from 10 to 20% by weight, chromium is present in an amount from 27 to 28% by weight, silicon is present in an amount from 0.9 to 1.1% by weight, and zirconium is present in an amount from 0.48 to 0.61% by weight.
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) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |