ENGINE VALVES
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United States of America Patent
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Issued Date -
Jun 30, 2011
app pub date -
Dec 23, 2010
filing date -
Dec 24, 2009
priority date (Note) -
Abandoned
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Abstract
An engine valve according to the present teaching has a hot-forged head portion having an oxidized surface layer at a radially outer peripheral surface. The oxidized surface layer is formed during hot-forging of the head portion.
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