Metal deforming – With 'coating' of work – Metal coating
Reexamination Certificate
2010-02-15
2010-10-19
Tolan, Edward (Department: 3725)
Metal deforming
With 'coating' of work
Metal coating
C072S208000
Reexamination Certificate
active
07814771
ABSTRACT:
By using a plating bath containing chromic acid: 100 to 250 g/L, sulfate radical: 3.0 to 5.5 g/L, and a catalyst: 100 to 200% (a weight ratio to the chromic acid content) for conducting electroplating, a Cr-plating film which has an increased film crack density is formed on the surface of a mandrel bar base metal, whereby peeling-off of the Cr-plating film can be suppressed in mandrel mill rolling for extending the service life of the mandrel bar.
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International Search Report in corresponding PCT.JP2009/055272 issued by the Japanese Patent Office Apr. 14, 2009.
Hirase Naoya
Kimoto Masaya
Marshall & Gerstein & Borun LLP
Sumitomo Metal Industries Ltd.
Tolan Edward
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