Patent US4621248A successfully refreshed from Google Patents.
US4621248A
Expired / Lapsed
US
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Amorphous cut core
Assignee: DK Corp 13-1 NIHONBASHI 1-CHOME CHUO-KU TOKYO
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Filing: 1984-06-18
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Granted: 1986-11-04
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Expires: 2004-06-18
Abstract
Abstract The present invention relates to a core of magnetic amorphous alloy. A thin strip of such alloy is wound and then cut to provide, e.g., C-shaped pieces. A pair of C-shaped pieces is assembled to provide the core. Conventionally, the magnetic properties, e.g., the watt loss, of the core are impaired at the cut ends of a thin strip due to the formation of burrs. The present invention is characterized by providing the cut ends with a thickness substantially the same as the thickness of the non-cut portion of the thin strip and by polishing the cut ends substantially parallel to the major surface of the thin strip, thereby improving the magnetic properties of the core.
Inventors
- 👤 Masao Shigeta
- 👤 Shotatsu Sugenoya
- 👤 Tsutomu Cho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:28
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/24; H01F27/25; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
An amorphous cut core having a predetermined shape and comprising: a wound body of a thin strip of magnetic amorphous alloy, said wound body having wound inner and outer surfaces including an open gap between layers of the wound thin strip of magnetic amorphous alloy, and a cut surface being formed across the wound thin strip of magnetic amorphous alloy, said predetermined shape being defined by said wound inner and outer surfaces, characterized in that the cut surface has polishing marks in a direction substantially parallel to a major surface thereof, the thickness of the thin strip of magnetic amorphous alloy, at the cut surface of the wound thin strip is 1.2 times or less the thickness of the thin strip of magnetic amorphous alloy at the remaining non-cut portion of the wound thin strip, and the cut core has no trapped acid in the gaps between the layers of strips of magnetic amorphous alloy.
Claim 2
Dependent Claim
155 words
An amorphous cut core having a predetermined shape and comprising: a wound body of a thin strip of magnetic amorphous alloy, said wound body having wound inner and outer surfaces including an open gap between layers of the wound thin strip of magnetic amorphous alloy, and a cut surface being formed across the wound thin strip of magnetic amorphous alloy, said predetermined shape being defined by said wound inner and outer surfaces, characterized in that the cut surface has polishing marks in a direction substantially parallel to a major surface thereof, the thickness of the thin strip of magnetic amorphous alloy, at the cut surface of the wound thin strip is 1.2 times or less the thickness of the thin strip of magnetic amorphous alloy at the remaining non-cut portion of the wound thin strip, and the cut core has no trapped acid in the gaps between the layers of strips of magnetic amorphous alloy.
References Cited (Backward Citations)
US2293951A
Cited
US2554262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-03 | 1990-05-05 | 1990-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-03 | 1994-05-05 | 1994-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-03 | 1998-05-05 | 1998-11-04 | $7700.00 | Window Closed / Lapsed |