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For the Inventor, By the Inventor

Kitakyushu, Japan

Casle Industrial Co., Ltd.


USPTO Granted Patents = 1

Forward Citations = 4

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1 inventor (with patents filed for the assignee):

goldMedal Kenji Watanabe (1 out of 6 patents)


1 patent:

1. 5107580 - Method of attaching sheet filter to inlet opening of ventilation fan or (1992-04-28),
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USPTO Data Jan 1 1976 - Dec 16 2025

1 Patents

#21 in Kitakyushu

#15,539 in Japan

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Kitakyushu, Japan

Casle Industrial Co., Ltd.

Forward Citations = 4

1 inventor:

goldMedal Kenji Watanabe (1 out of 6 patents)

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