Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Reexamination Certificate
2011-06-07
2011-06-07
Sheehan, John P (Department: 1793)
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
C148S101000
Reexamination Certificate
active
07955442
ABSTRACT:
The present invention provides a method for producing a sintered magnet, which can have a sufficient sintered density even when the magnet has a low-R composition. The method is for producing a sintered magnet comprising R (R: one or more rare-earth elements), T (T: one or more transition metal elements essentially comprising Fe, or Fe and Co) and B (boron) as the main components, wherein a starting alloy prepared by strip casting is pulverized to a given particle size to form a fine powder, where the starting alloy comprises discolored deposit1on the surface and the area ratio of the discolored deposit1is 1.5% or less, the resulting fine powder is compacted in a magnetic field to prepare a compact, and the compact is sintered.
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ASM Material Engineering Dictionary, Edited by J. R. Davis 1992, p. 239.
Chinese language office action and its English translation for corresponding Chinese application No. 2004100947629 provides a statement of relevancy for Chinese document No. 107115.
Hidaka Tetsuya
Ishizaka Chikara
Adli Dariush G.
Adli Law Group P.C.
Sheehan John P
TDK Corporation
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