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Wei-Jen Hsu
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Banciao City, TW
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Patents Grants
last 30 patents
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Patent Grant
Light-emitting structure for generating an annular illumination effect
Patent number
7,699,490
Issue date
Apr 20, 2010
Ledtech Electronics Corp.
Chien-Hung Tsai
F21 - LIGHTING
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last 30 patents
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Patent Application
Light-emitting structure for generating an annular illumination effect
Publication number
20100002425
Publication date
Jan 7, 2010
Chien-Hung Tsai
G02 - OPTICS