14 Utility Patents
#2 in Hanyu
#58,166 in Japan
#270,802 in the World
Forward Citations = 157
Company Filing History:
Nippon Piston Ring Co., Ltd.
Nippon Piston Ring Kabushiki Kaisha
Kabushiki Kaisha Tokiwa Seisakusho
where one patent can have more than one assignee
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