Tokyo, Japan

Sumitomo Coal Mining Co., Ltd.


USPTO Granted Patents = 3

Forward Citations = 23

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4 inventors (with patents filed for the assignee):

goldMedal Masao Tokita (3 out of 5 patents)

silverMedal Yoshito Miyasaka (1 out of 3 patents)

bronzeMedal Hitoshi Karasawa (1 out of 3 patents)

4 Fumitake Nishiyama (1 out of 2 patents)


3 patents:

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USPTO Data Jan 1 1976 - Dec 9 2025

3 Patents

#3,271 in Tokyo

#8,780 in Japan

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Tokyo, Japan
Forward Citations = 23

4 inventors:

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