US4600911A
Expired / Lapsed
US
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Elliptically shaped magnetic core
Assignee: PAUWELS-TRAFO BELGIUM NV
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Filing: 1985-03-14
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Granted: 1986-07-15
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Expires: 2005-03-14
Abstract
Abstract The magnetic core comprises a stack of plates which extend mainly along a single axial direction. The stack cross-section has as envelope a curve comprised of two half circles with a radius a/2 and of two straight lines with a length (b-a) which connect together the end points of the half circles. The ratio b/a lies between 1.05 and 2 and preferably between 1.3 and 1.7.
Inventors
- 👤 Heinz Meinert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:30
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/24; H01F27/245
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
122 words
A magnetic core comprised of a stack of plates which extend mainly along a single axial direction and which contact one another with main surfaces, the cross-section having as envelope a closed curve without discontinuities comprised of two halves from an ellipse spaced along a short axis with dimension a and two straight lines which connect together end points of the half ellipses, said closed curve thus having a first symmetry axis which lies in parallel relationship with the plates and a second symmetry axis at right angle thereto, whereby the spacing b between intersection points of the curve with the second symmetry axis is markedly wider than the spacing a between intersection points of the curve with the first symmetry axis.
Claim 2
Dependent Claim
122 words
A magnetic core comprised of a stack of plates which extend mainly along a single axial direction and which contact one another with main surfaces, the cross-section having as envelope a closed curve without discontinuities comprised of two halves from an ellipse spaced along a short axis with dimension a and two straight lines which connect together end points of the half ellipses, said closed curve thus having a first symmetry axis which lies in parallel relationship with the plates and a second symmetry axis at right angle thereto, whereby the spacing b between intersection points of the curve with the second symmetry axis is markedly wider than the spacing a between intersection points of the curve with the first symmetry axis.
Claim 3
Dependent Claim
31 words
The magnetic core of claim 1, in which said two half ellipses are two half circles with a radius a/2 and said two straight lines thus have a length of (b-a).
Claim 4
Dependent Claim
16 words
The magnetic core of claim 2, in which the ratio b/a lies between 1.05 and 2.
Claim 5
Dependent Claim
16 words
The magnetic core of claim 2, in which the ratio b/a lies between 1.3 and 1.7.
Claim 6
Dependent Claim
12 words
The magnetic core of claim 1, having a flattening inside the envelope.
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) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |