Patent US5239744A successfully refreshed from Google Patents.
US5239744A
Expired / Lapsed
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Method for making multilayer magnetic components
Assignee: Nokia Bell Labs
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Filing: 1992-01-09
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Granted: 1993-08-31
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Expires: 2012-01-09
Abstract
Abstract Multilayer magnetic components can be made with reduced cracking and magnetic degradation by forming layers having patterns of magnetic and insulating regions separated by regions that are removable during sintering. Advantageously, when the layers are stacked, layers of removable material are also disposed between magnetic regions and insulating regions so as to produce upon sintering a magnetic core within an insulating body wherein the core is substantially completely surrounded by a thin layer of free space.
Inventors
- 👤 Debra A. Fleming
- 👤 David W. Johnson, Jr.
- 👤 Warren W. Rhodes
- 👤 Apurba Roy
- 👤 John Thomson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:30
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/14; H01F41/16; B; B28; B28B; B28B1/00; B28B1/48; B28B7/00; B28B7/34; B28B7/342; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49826; Y10T29/49833
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
In the method of making a magnetic device comprising the steps of forming a plurality of layers comprising one or more insulating regions and one or more magnetic regions, forming a stack of said layers, laminating said stack and sintering the laminated stack, the improvement wherein: at least one layer of said plurality comprises a region of removable material for dissipating prior to completion of sintering disposed between said insulating regions and said magnetic regions thereby separating said insulating and magnetic regions.
Claim 2
Dependent Claim
82 words
In the method of making a magnetic device comprising the steps of forming a plurality of layers comprising one or more insulating regions and one or more magnetic regions, forming a stack of said layers, laminating said stack and sintering the laminated stack, the improvement wherein: at least one layer of said plurality comprises a region of removable material for dissipating prior to completion of sintering disposed between said insulating regions and said magnetic regions thereby separating said insulating and magnetic regions.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein each layer of said plurality comprises a region of removable material disposed between said insulating regions and said magnetic regions.
Claim 4
Dependent Claim
43 words
The method of claim 1 wherein said plurality of layers comprise outer insulating regions and inner magnetic regions to form a magnetic device having an outer insulating region substantially surrounding one or more inner magnetic regions spaced apart from said outer insulating region.
Claim 5
Dependent Claim
19 words
The method of claim 1 further comprising the step of forming one or more conductors in said insulating regions.
Claim 6
Dependent Claim
15 words
The method of claim 4 wherein said conductors wind around at least one magnetic region.
Claim 7
Independent Claim
54 words
The method of claims 4 or 5 wherein said conductors are formed by providing said insulating regions with regions of removable material in the configuration of the desired conductor, effecting the dissipation of said removable material prior to the completion of sintering, and back-filling with fluid conductive material the voids created by said dissipation.
Claim 8
Dependent Claim
32 words
The method of claim 1 wherein said region of removable material includes a plurality of non-removable supporting post regions having areas small compared to the area of the region of removable material.
References Cited (Backward Citations)
US3768144A
Cited
US3965552A
Cited
US4301580A
Cited
US4482933A
Cited
US4584629A
Cited
US4652967A
Cited
US4797780A
Cited
US4829399A
Cited
US4913932A
Cited
US4819128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-30 | 1997-03-01 | 1997-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-30 | 2001-03-01 | 2001-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-30 | 2005-03-01 | 2005-08-31 | $7700.00 | Window Closed / Lapsed |