17 Utility Patents
#108 in Fukuoka
#45,223 in Japan
#209,933 in the World
Forward Citations = 258
Company Filing History:
Nippon Tungsten Co., Ltd.
Sumitomo Special Metals Co., Ltd.

4. 1 out of 26
Sumitomo Special Metal Co. Ltd.
where one patent can have more than one assignee
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