Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Chun Chen Lai0
Date of Patent
January 4, 2011
0Patent Application Number
121503600
Date Filed
April 28, 2008
0Patent Primary Examiner
Patent abstract
A surface grinder for a ball of a ball valve comprises a ball positioning device at an X axis for driving the ball to rotate about the X axis and a grinding device at a Z axis for driving a grindstone set to rotate about the Z axis, wherein the grindstone set grinds a spherical surface of the ball.
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