Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Katsunori Yokoyama0
Date of Patent
April 29, 2008
0Patent Application Number
112756020
Date Filed
January 18, 2006
0Patent Primary Examiner
Patent abstract
A developer feeding screw, which includes a shaft and a helical shape portion around said shaft, for feeding a developer in a direction of an axis of said shaft by rotation about the axis, said feeding screw, the improvement residing in that:a sectional configuration of said helical shape portion in a plane including the axis satisfies:Z(r)=kln(ro/r)where z(r) is a height of said sectional configuration at radius r with z(ro)=0 (ro is an outer radius of the helical configuration):r is a radius (0<r≦ro)k is a constant.
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