US5032355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing sintering product of Fe-Co alloy soft magnetic material
Assignee: Sumitomo Metal Mining Co Ltd
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Filing: 1990-10-01
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Granted: 1991-07-16
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Expires: 2010-10-01
Abstract
Abstract A method of manufacturing a sintering product of Fe-Co alloy soft magnetic material by molding a powder comprising from 40 to 60% by weight of Co and the substantial balance of Fe, sintering the molding product and then applying heat treatment, wherein cooling after the heat treatment is conducted as slow cooling at a cooling rate of not more than 50° C./min.
Inventors
- 👤 Masakazu Achikita
- 👤 Akihito Ohtsuka
- 👤 Shinichi Sogame
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:39
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/20; H01F1/22; C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
63 words
A method of manufacturing a sintering product of Fe-Co alloy soft magnetic material by molding a powder comprising from 40 to 60% by weight of Co and the substantial balance of Fe to form a molding product, sintering the molding product, then applying a heat treatment, and then cooling after the heat treatment at a cooling rate of not more than 50° C./min.
Claim 2
Independent Claim
63 words
A method of manufacturing a sintering product of Fe-Co alloy soft magnetic material by molding a powder comprising from 40 to 60% by weight of Co and the substantial balance of Fe to form a molding product, sintering the molding product, then applying a heat treatment, and then cooling after the heat treatment at a cooling rate of not more than 50° C./min.
Claim 3
Dependent Claim
21 words
A manufacturing method as defined in claim 1, wherein the sintering is conducted at a temperature from 1100° to 1450° C.
Claim 4
Dependent Claim
22 words
A manufacturing method as defined in claim 1, wherein the heat treatment is applied at a temperature from 700° to 850° C.
Claim 5
Dependent Claim
21 words
A manufacturing method as defined in claim 1, wherein the grain size of the powder is not greater than 45 μm.
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) | 1994-07-15 | 1995-01-14 | 1995-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-15 | 1999-01-14 | 1999-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-15 | 2003-01-14 | 2003-07-16 | $7700.00 | Window Closed / Lapsed |