Patent US854465A successfully refreshed from Google Patents.
Patent US4255494A successfully refreshed from Google Patents.
US4255494A
Expired / Lapsed
US
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Sintered ferromagnetic powder metal parts for alternating current applications
Assignee: KEYSTONE CARBON COMPANY A PA CORP
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Filing: 1979-04-25
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Granted: 1981-03-10
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Expires: 1999-04-25
Abstract
Abstract A method of making a metal core for alternating current applications by powder metallurgy is disclosed. Ferro-magnetic powder is pressed into a cross section of the core, with the thickness of the cross section approaching that below which the green density is no longer uniform throughout the volume of the part. Additional cross sections are pressed to meet the overall core thickness requirement when the sections are subsequently stacked. The sections are stacked in non contacting relationship and sintered. The sections are separated by an air gap or magnetic insulating medium.
Inventors
- 👤 Orville W. Reen
- 👤 Merlin L. Osborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:54
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206; H01F41/0246; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
94 words
A method of making a metal core for alternating current applications from ferromagnetic powder, comprising pressing a ferromagnetic powder into a cross section of the core, with the thickness of the cross section approaching that below which the green density is no longer uniform throughout the volume of the part, pressing sufficient additional ferromagnetic powder metal cross sections to meet an overall core thickness requirement when the individual cross sections are subsequently stacked, stacking the individual cross sections with the cross sectional faces of adjacent parts in noncontacting relationship, and sintering the cross sections.
Claim 2
Independent Claim
94 words
A method of making a metal core for alternating current applications from ferromagnetic powder, comprising pressing a ferromagnetic powder into a cross section of the core, with the thickness of the cross section approaching that below which the green density is no longer uniform throughout the volume of the part, pressing sufficient additional ferromagnetic powder metal cross sections to meet an overall core thickness requirement when the individual cross sections are subsequently stacked, stacking the individual cross sections with the cross sectional faces of adjacent parts in noncontacting relationship, and sintering the cross sections.
Claim 3
Dependent Claim
19 words
The method as set forth in claim 1 wherein the individual cross sections are separated by an air gap.
Claim 4
Dependent Claim
20 words
The method as set forth in claim 1 wherein the individual cross sections are separated by a magnetic insulating medium.
Claim 5
Dependent Claim
27 words
The method as set forth in claim 3 wherein the magnetic insulating medium is selected from the group consisting of aluminum oxide, zirconium oxide and insulating paper.
Claim 6
Dependent Claim
39 words
The method as set forth in claim 1 wherein the core exhibits a 60 Hertz core loss of less than 2.0 watts per pound when subjected to an alternating current magnetizing force at an induction level of 7 kilogauss.
Claim 7
Dependent Claim
18 words
The method as set forth in claim 1 wherein the individual cross sections are sintered prior to stacking.
Claim 8
Independent Claim
16 words
The method as set forth in claim wherein the individual cross sections are sintered after stacking.
Claim 9
Dependent Claim
21 words
The method as set forth in claim 1 wherein the thickness of the individual cross sections is at least 0.008 inch.
Claim 10
Dependent Claim
21 words
The method as set forth in claim 8 wherein the thickness of the individual cross sections is less than 0.150 inch.
Claim 11
Dependent Claim
148 words
A ferromagnetic powder metal core for alternating current applications said core consisting of a plurality of core cross sections, each cross section having a fixed cross sectional dimension, with the sections arranged such that the faces of adjacent parts are stacked in vertical alignment in noncontacting relationship, said core produced by pressing a ferromagnetic powder into a cross section of the core, with the thickness of the cross section approaching that below which the green density is no longer uniform throughout the volume of the part, pressing sufficient magnetic powder metal cross sections to meet the overall core thickness requirement when the cross sections are subsequently stacked in vertical alignment with all individual cross sections of substantially equal thickness of at least 0.008 inch, assembling the individual cross sections in vertical alignment with the cross sectional faces of adjacent parts in noncontacting relationship, and sintering the cross sections.
Claim 12
Dependent Claim
148 words
A ferromagnetic powder metal core for alternating current applications said core consisting of a plurality of core cross sections, each cross section having a fixed cross sectional dimension, with the sections arranged such that the faces of adjacent parts are stacked in vertical alignment in noncontacting relationship, said core produced by pressing a ferromagnetic powder into a cross section of the core, with the thickness of the cross section approaching that below which the green density is no longer uniform throughout the volume of the part, pressing sufficient magnetic powder metal cross sections to meet the overall core thickness requirement when the cross sections are subsequently stacked in vertical alignment with all individual cross sections of substantially equal thickness of at least 0.008 inch, assembling the individual cross sections in vertical alignment with the cross sectional faces of adjacent parts in noncontacting relationship, and sintering the cross sections.
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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) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |