19 Utility Patents
#335 in Wako
#38,238 in Japan
#174,306 in the World
Forward Citations = 197
Company Filing History:


Hitachi Powdered Metals Co., Ltd.
4. 2 out of 229
Nippon Piston Ring Co., Ltd.
5. 1 out of 2,333

where one patent can have more than one assignee
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