Gyeongsangbuk-do, South Korea

Youil Corporation Co., Ltd.


USPTO Granted Patents = 2


Forward Citations = 23

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4 inventors (with patents filed for the assignee):

goldMedal Hoo-Sung Chang (2 out of 2 patents)

silverMedal Il-Sun Ryu (2 out of 2 patents)

bronzeMedal Il Sun Ryu (0 patent)

4 Hoo Sung Chang (0 patent)


2 patents:

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USPTO Data Jan 1 1976 - Dec 9 2025

2 Patents

#31 in Gyeongsangbuk-do

#3,600 in South Korea

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Gyeongsangbuk-do, South Korea
Forward Citations = 23

4 inventors:

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