For the Inventor, By the Inventor

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Kaohsiung, Taiwan

Chen Chang Co., Ltd.

USPTO Granted Patents = 2

Forward Citations = 39

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2 inventors (with patents filed for the assignee):

Hui-Nan Yu (1 out of 29 patents)

Feng-Nien Tsai (1 out of 3 patents)

2 patents: Sort by Forward Citations

1. D479805 - Sun protection factor indicator (2003-09-24),

2. 6254518 - Exercise wheel (2001-07-03),

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USPTO Data Jan 1 1976 - Dec 16 2025

2 Patents

#125 in Kaohsiung

#4,103 in Taiwan

Kaohsiung, Taiwan

Chen Chang Co., Ltd.

Forward Citations = 39

2 inventors:

Hui-Nan Yu (1 out of 29 patents)

Feng-Nien Tsai (1 out of 3 patents)

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