Patent US5300911A successfully refreshed from Google Patents.
US5300911A
Expired / Lapsed
US
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Monolithic magnetic device with printed circuit interconnections
Assignee: International Business Machines Corp
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Filing: 1992-10-09
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Granted: 1994-04-05
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Expires: 2012-10-09
Abstract
Abstract A monolithic magnetic device having a plurality of transformer elements having single turn primaries and single turn secondaries fabricated on a plate of ferrite which has the outline of a ceramic leadless chip carrier. Each of the magnetic elements has a primary winding formed from a copper via plated on the ferrite. Each element's secondary is another copper via plated over an insulating layer formed over the first layer of copper. The elements' primaries are interconnected on the first copper layer and the elements' secondaries are interconnected on the second copper layer. The configuration and turns ratio of the transformer are determined by the series and or parallel interconnections of the primary and secondaries. Some of the interconnections can be provided by the next higher assembly level through the circuit card, with the same magnetic device providing many turns ratio combinations or values of inductors.
Inventors
- 👤 Michael M. Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:28
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/0006; H01F17/0033; H01F2017/004; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49073
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
154 words
A magnetic device comprising: a plate of flux permeable substantially noncurrent conducting material defining a plurality of holes extending therethrough; a first layer of electrically current conductive material covering the walls of the holes and electrically connecting at least some of the first layer conductive material in the holes to one another; an electrically insulating layer covering the first layer of conductive material; a second layer of electrically current conductive material covering the insulating layer on the walls of each of the holes and electrically connecting at least some of the second layer of material in the holes to one another; at least one termination means for surface mounting said plate and electrically connecting to the first layer of material in at least some of said holes; and at least one termination means for surface mounting said plate and electrically connecting to the second layer of material in at least some of said holes.
Claim 2
Dependent Claim
154 words
A magnetic device comprising: a plate of flux permeable substantially noncurrent conducting material defining a plurality of holes extending therethrough; a first layer of electrically current conductive material covering the walls of the holes and electrically connecting at least some of the first layer conductive material in the holes to one another; an electrically insulating layer covering the first layer of conductive material; a second layer of electrically current conductive material covering the insulating layer on the walls of each of the holes and electrically connecting at least some of the second layer of material in the holes to one another; at least one termination means for surface mounting said plate and electrically connecting to the first layer of material in at least some of said holes; and at least one termination means for surface mounting said plate and electrically connecting to the second layer of material in at least some of said holes.
Claim 3
Dependent Claim
17 words
The magnetic device of claim 1 wherein said holes extend perpendicular to the face of the plate.
Claim 4
Dependent Claim
18 words
The magnetic device of claim 1 wherein said termination means are located on one side of said plate.
Claim 5
Dependent Claim
17 words
The magnetic device of claim 2 wherein said plate has the shape of a ceramic chip carrier.
Claim 6
Dependent Claim
16 words
The magnetic device of claim 2 wherein said flux permeable substantially noncurrent conducting material comprises ferrite.
Claim 7
Dependent Claim
14 words
The magnetic device of claim 5 wherein said electrically current conductive material comprises copper.
Claim 8
Dependent Claim
14 words
The magnetic device of claim 6 wherein the insulating layer comprises parylene thermoplastic polymer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-04-04 | 1997-10-04 | 1998-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-04 | 2001-10-04 | 2002-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-04 | 2005-10-04 | 2006-04-05 | $7700.00 | Window Closed / Lapsed |