Metal treatment – Stock – Ferrous
Reexamination Certificate
2003-03-26
2009-10-06
Yee, Deborah (Department: 1793)
Metal treatment
Stock
Ferrous
C148S333000, C148S335000, C148S580000, C148S595000, C148S598000
Reexamination Certificate
active
07597768
ABSTRACT:
Disclosed is a hard-drawn spring which exhibits fatigue strength and sag resistance equal or superior to springs produced using an oil-tempered wire. The hard-drawn spring is produced using a steel wire containing 0.5 to 0.7 mass % of C, 1.0 to 1.95 mass % of Si, 0.5 to 1.5 mass % of Mn and 0.5 to 1.5 mass % of Cr, with the balance being Fe and inevitable impurities. In the steel wire, the number of carbides having circle-equivalent diameters of 0.1 μm or more is 5 particles/100 μm2or less.
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Harada Koji
Ibaraki Nobuhiko
Suda Sumie
Yoshida Shigetsugu
Yoshihara Nao
Kabushiki Kaisha Kobe Seiko Sho
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Suncall Corporation
Yee Deborah
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