Tokyo, Japan

Petroleum Energy Center, a Juridical Incorporated Foundation


USPTO Granted Patents = 3

Forward Citations = 19

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5 inventors (with patents filed for the assignee):

goldMedal Toshihiro Iwakuma (1 out of 89 patents)

silverMedal Yoshinari Koyama (1 out of 38 patents)

bronzeMedal Takashi Arakane (1 out of 27 patents)

4 Tadashi Katafuchi (1 out of 17 patents)

5 Tadashi Kusumoto (1 out of 22 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 = 19

5 inventors:

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