Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Reexamination Certificate
2005-01-21
2008-08-26
Sheehan, John P. (Department: 1793)
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
C148S302000, C419S010000, C419S038000, C419S053000
Reexamination Certificate
active
07416613
ABSTRACT:
A method for compacting a magnetic powder in a magnetic field comprising steps of filling a die with a magnetic powder, applying a pulsed magnetic field to the magnetic powder in the die to orientate the powder, and compressing the magnetic powder, wherein the pulsed magnetic field is applied twice or more when density ρ of a compacted body of said magnetic powder satisfies the relationship ρ=α×H0.5+β(α=0.63 and β=1 to 2), where H is intensity (T) of the applied magnetic field.
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Chinese language office action for corresponding Chinese patent application No. 2005100057640 lists the references above.
Chou Tsutomu
Hatakeyama Masatoshi
Ishizaka Chikara
Nishizawa Gouichi
Hogan & Hartson LLP
Sheehan John P.
TDK Corporation
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