Hitoshi Masaki

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Hidaka-gun, JP

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Patents Grantslast 30 patents

Information Patent Grant
Light diffusion sheet and backlight unit using the same
- Patent number 6,871,994
- Issue date Mar 29, 2005
- Keiwa Kabushiki Kaisha
- Kenichi Harada
- F21 - LIGHTING
Information Patent Grant
Light diffusion sheet and backlight unit using the same
- Patent number 6,709,143
- Issue date Mar 23, 2004
- Keiwa Kabushiki Kaisha
- Kenichi Harada
- F21 - LIGHTING

Patents Applicationslast 30 patents

Information Patent Application
Optical sheet and backlight unit using the same
- Publication number 20050068628
- Publication date Mar 31, 2005
- KEIWA INC.
- Hitoshi Masaki
- G02 - OPTICS
Information Patent Application
Light diffusion sheet and backlight unit using the same
- Publication number 20040047163
- Publication date Mar 11, 2004
- ARCO PATENT OFFICE
- Kenichi Harada
- G02 - OPTICS
Information Patent Application
Light diffusion sheet and backlight unit using the same
- Publication number 20020114169
- Publication date Aug 22, 2002
- Kenichi Harada
- G02 - OPTICS