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For the Inventor, By the Inventor

Tokyo, Japan

Tone Corporation


USPTO Granted Patents = 2

Forward Citations = 6

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5 inventors (with patents filed for the assignee):

goldMedal Taro Watanabe (2 out of 14 patents)

silverMedal Hiroyuki Kawasaki (1 out of 28 patents)

bronzeMedal Yoshio Akiyama (1 out of 1 patent)

4.  Osamu Miyamoto (1 out of 1 patent)

5.  Nobuhisa Ikeda (1 out of 1 patent)


2 patents:

1. 6467558 - Multiple air hammer apparatus and excavating direction correcting method therefor (2002-10-22),
2. 5881827 - Extendable bit (1999-03-16),
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USPTO Data Jan 1 1976 - Dec 30 2025

2 Patents

#4,066 in Tokyo

#10,973 in Japan

...
Tokyo, Japan

Tone Corporation

Forward Citations = 6

5 inventors:

goldMedal Taro Watanabe (2 out of 14 patents)

silverMedal Hiroyuki Kawasaki (1 out of 28 patents)

bronzeMedal Yoshio Akiyama (1 out of 1 patent)

4.  Osamu Miyamoto (1 out of 1 patent)

5.  Nobuhisa Ikeda (1 out of 1 patent)

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