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Takaharu Tsugane
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Tokyo, JP
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Patents Grants
last 30 patents
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Patent Grant
Light guide plate, sidelight type light source device and image dis...
Patent number
6,607,281
Issue date
Aug 19, 2003
International Business Machines Corporation
Masaki Ono
F21 - LIGHTING
Patents Applications
last 30 patents
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Patent Application
Light guide plate, sidelight type light source device and image dis...
Publication number
20020044438
Publication date
Apr 18, 2002
Masaki Ono
G02 - OPTICS