Tokyo, Japan

Penta-ocean Construction Co., Ltd.


USPTO Granted Patents = 3

Forward Citations = 9

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8 inventors (with patents filed for the assignee):

goldMedal Hiromichi Yamashita (1 out of 9 patents)

silverMedal Toshio Akesaka (1 out of 36 patents)

bronzeMedal Hiroji Tanaka (1 out of 1 patent)

4 Nobuharu Hayashi (1 out of 1 patent)

5 Kazuto Hamada (1 out of 2 patents)

6 Kenji Takagi (1 out of 1 patent)

7 Hideaki Mutsuro (1 out of 1 patent)

8 Yoshiharu Watari (1 out of 1 patent)


3 patents:

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USPTO Data Jan 1 1976 - Dec 2 2025

3 Patents

#3,271 in Tokyo

#8,779 in Japan

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Tokyo, Japan
Forward Citations = 9

8 inventors:

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