Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Eishin Matsui0
Tomoya Takata0
Yoshiaki Takagi0
Yoshihiro Fukushima0
Date of Patent
January 6, 2009
0Patent Application Number
105589320
Date Filed
June 3, 2004
0Patent Primary Examiner
Patent abstract
A friction material for a synchronizer ring comprises (A) a petroleum coke with an ash content of 0.1 mass % to 8 mass % or (B) a pitch coke with an ash content of 0.1 mass % to 8 mass %, more preferably (C) a calcined petroleum coke with an ash content of 0.1 mass % to 1 mass % or (D) a foundry coke with an ash content of 5 mass % to 8 mass %. The friction material is effectively used for a synchronizer ring requiring high coefficient of dynamic friction.
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