For the Inventor, By the Inventor

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Yokohoma, Japan

Sanwa Kokan Kabushiki Kaishas

USPTO Granted Patents = 1

Forward Citations = 9

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2 inventors (with patents filed for the assignee):

Toshio Sakurai (1 out of 7 patents)

Yutaka Sunaga (1 out of 3 patents)

1 patent: Sort by Forward Citations

1. 4726211 - Method of cold drawing seamless metal tubes each having an upset portion (1988-02-23),

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USPTO Data Jan 1 1976 - Dec 16 2025

1 Patents

#1 in Yokohoma

#15,539 in Japan

Yokohoma, Japan

Sanwa Kokan Kabushiki Kaishas

Forward Citations = 9

2 inventors:

Toshio Sakurai (1 out of 7 patents)

Yutaka Sunaga (1 out of 3 patents)

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