Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Morihiro Sudo0
Tsuyoshi Koshidaka0
Date of Patent
August 3, 2010
0Patent Application Number
112923430
Date Filed
December 2, 2005
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A rubber-made syringe piston with a film laminated on it includes a plurality of annular ridges of different outer diameters formed continuously and integrally on a sliding surface of a liquid-contacting, leading end portion of the piston. The annular ridges may preferably be different by from 0.01 to 0.2 mm from one to another in outer diameter.
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