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Tonan Kaihatsu Kogyo Co., Ltd.

USPTO Granted Patents = 2

Forward Citations = 22

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4 inventors (with patents filed for the assignee):

Hisashi Kitajima (2 out of 4 patents)

Sakae Sano (2 out of 3 patents)

Hiroshi Iimori (2 out of 2 patents)

4. Tadashi Nishio (2 out of 2 patents)

2 patents: Sort by Forward Citations

1. 4545702 - Boring-injection device, method for improving ground by means of the (1985-10-08),

2. 4514112 - Method for injecting grouting agent and apparatus for conducting the (1985-04-30),

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USPTO Data Jan 1 1976 - Dec 16 2025

2 Patents

#4,062 in Tokyo

#10,962 in Japan

Tonan Kaihatsu Kogyo Co., Ltd.

Forward Citations = 22

4 inventors:

Hisashi Kitajima (2 out of 4 patents)

Sakae Sano (2 out of 3 patents)

Hiroshi Iimori (2 out of 2 patents)

4. Tadashi Nishio (2 out of 2 patents)

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