Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Consolidation of powder prior to sintering
Reexamination Certificate
2011-03-01
2011-03-01
Le, Emily M. (Department: 1734)
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Consolidation of powder prior to sintering
C075S230000
Reexamination Certificate
active
07897102
ABSTRACT:
A powder metallurgy method for making valve guides for use in internal combustion engines advantageously utilizes uniaxial side pressing to form compacts. Such compacts are subsequently sintered, formed into a cylindrical shape, and then hollowed to form a valve guide. The valve guides exhibit improved uniformity and density and hardness from end to end of the valve guide when contrasted to powder metal valve guides formed with uniaxial end pressing.
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European Search Report, dated Nov. 25, 2005 issued for European patent application counterpart of above application.
Blackwell C. Bruce
Livingston Howard M.
Helio Precision Products, Inc.
Le Emily M.
White Gerald K.
Zhu Weiping
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