Substantially cylindrical powder compact and die assembly for compacting powder
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United States of America Patent
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Nov 3, 2015
Grant Date -
Mar 8, 2012
app pub date -
May 12, 2010
filing date -
May 13, 2009
priority date (Note) -
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Abstract
The cross-sectional shape of a main part except for both end portions is generally divided into a lower arc surface extending along a base circle and an upper arc surface of which a top portion corresponds to the base circle. Side edge portions extending inward from the base circle are formed on both side surfaces of the upper arc surface. Curved edge portions which concavely curves upward from the side edge portions to end surfaces and continues to the end surfaces and chamfer portions extending from the end surfaces to the side surfaces which planes the edges and curves so that width thereof gradually narrows, are formed on both ends in a longitudinal direction.
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