US4368447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rolled core
Assignee: Toshiba Corp
•
Filing: 1981-04-03
•
Granted: 1983-01-11
•
Expires: 2001-04-03
Abstract
Abstract A rolled core is formed by winding a thin body of an amorphous magnetic alloy having positive magnetostriction characteristics so that, of the two surfaces the surface of smaller surface coarseness faces inward. This rolled core is improved in iron loss over a rolled core obtained by winding the thin body so that the surface of greater surface coarseness faces inward. Breakage of the thin body tends to occur less frequently when it is wound so that the surface faces inward.
Inventors
- 👤 Koichiro Inomata
- 👤 Michio Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:45
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15341; H01F27/00; H01F27/24; H01F27/25; H01F3/00; H01F3/04; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12993
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
39 words
A rolled core formed by winding a thin body of an amorphous magnetic alloy having positive magnetostriction characteristics, characterized in that said thin body is wound with the surface of smaller surface coarseness of said thin body facing inward.
Claim 2
Dependent Claim
39 words
A rolled core formed by winding a thin body of an amorphous magnetic alloy having positive magnetostriction characteristics, characterized in that said thin body is wound with the surface of smaller surface coarseness of said thin body facing inward.
Claim 3
Dependent Claim
47 words
A rolled core according to claim 1, wherein said surface of smaller surface coarseness is a surface which has been brought into contact with a solid cooling medium, and the other surface is a free surface which has not come in contact with the solid cooling medium.
Claim 4
Dependent Claim
49 words
A rolled core according to claim 1, wherein said amorphous magnetic alloy having positive magnetostriction characteristics is represented by the general formula: (Fe.sub.1-x-y.Ni.sub.x Co.sub.y).sub.1-a X.sub.a wherein X is at least one elements selected from the group consisting of P, B, C, Si, Ge, and Al; 0.15≦a≦0.35; 0≦x≦0.7; and 0≦y≦0.9.
References Cited (Backward Citations)
US4053331A
Cited
US4314594A
Cited
US4227120A
Cited
US4187128A
Cited
US4249969A
Cited
US4298409A
Cited
US4307771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |