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For the Inventor, By the Inventor

Tokyo, Japan

Nishihara Engineering Co., Ltd.


USPTO Granted Patents = 2

Forward Citations = 48

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2 inventors (with patents filed for the assignee):

goldMedal Takashi Watanabe (2 out of 61 patents)

silverMedal Koji Okamura (1 out of 1 patent)


2 patents:

1. 5560656 - Pipe connecting structure (1996-10-01),
2. 4839927 - Drainage system in multi-story building (1989-06-20),
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USPTO Data Jan 1 1976 - Dec 30 2025

2 Patents

#4,058 in Tokyo

#10,964 in Japan

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Tokyo, Japan

Nishihara Engineering Co., Ltd.

Forward Citations = 48

2 inventors:

goldMedal Takashi Watanabe (2 out of 61 patents)

silverMedal Koji Okamura (1 out of 1 patent)

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