For the Inventor, By the Inventor

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Ishizaki Co., Ltd.

USPTO Granted Patents = 3

EPO Patents = 1

Trademarks = 1

Forward Citations = 0

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9 inventors (with patents filed for the assignee):

Nobuyuki Ishizaki (3 out of 5 patents)

Takeshi Ouchi (3 out of 4 patents)

Futoshi Hasegawa (2 out of 12 patents)

4. Kazuhiko Kojima (2 out of 2 patents)

5. Daisuke Kikuchi (2 out of 44 patents)

6. Eiji Hara (2 out of 6 patents)

7. Yusuke Yoshida (1 out of 27 patents)

8. Kohei Mizutani (1 out of 2 patents)

9. Kazuhiro Ota (1 out of 2 patents)

3 patents: Sort by Forward Citations

1. 12292124 - Check valve (2025-05-06),

2. 11828373 - Check valve (2023-11-28),

3. 10907743 - Check valve and reciprocating body for check valve (2021-02-02),

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USPTO Data Jan 1 1976 - Dec 30 2025

3 Patents

#3,260 in Tokyo

#8,767 in Japan

Ishizaki Co., Ltd.

Forward Citations = 0

9 inventors:

Nobuyuki Ishizaki (3 out of 5 patents)

Takeshi Ouchi (3 out of 4 patents)

Futoshi Hasegawa (2 out of 12 patents)

4. Kazuhiko Kojima (2 out of 2 patents)

5. Daisuke Kikuchi (2 out of 44 patents)

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