Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Akihiro Shakagori0
Yukitomo Yamamoto0
Date of Patent
April 15, 2008
0Patent Application Number
105367400
Date Filed
January 12, 2003
0Patent Primary Examiner
Patent abstract
A seat ring having a hollow cylindrical body portion with a flange surface as each of its side surfaces. The cylindrical body portion has stem through-holes above and below along a stem axial direction X and a stem penetrates said through-holes. An outer circumference of the body portion is formed in an elliptic shape with the stem axial direction X as its longitudial axis. The thickness of the body portion where the stem through-holes are provided is the maximum while the thickness of the body portion along an axis perpendicular to the longitudinal axis is the minimum.
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