Metal treatment – Stock – Copper base
Reexamination Certificate
2011-02-08
2011-02-08
Mayes, Melvin C (Department: 1793)
Metal treatment
Stock
Copper base
Reexamination Certificate
active
07883589
ABSTRACT:
The free-cutting copper alloy according to the present invention contains a greatly reduced amount of lead in comparison with conventional free-cutting copper alloys, but provides industrially satisfactory machinability. The free-cutting alloys comprise 71.5 to 78.5 percent, by weight, of copper, 2.0 to 4.5 percent, by weight, of silicon, 0.005 percent up to but less than 0.02, by weight, of lead, and the remaining percent, by weight, of zinc.
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Cohen Stefanie
Griffin & Szipl, P.C.
Mayes Melvin C
Mitsubishi Shindoh Co. Ltd.
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