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Plastic lens and optical pickup device
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Patent number 8,102,604
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Issue date Jan 24, 2012
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Hitachi Maxell, Ltd.
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Tadahiro Kuwa
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Molded lens and molding tool
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Patent number 8,045,279
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Issue date Oct 25, 2011
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Hitachi Maxell, Ltd.
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Tadahiro Kuwa
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Case for flat objects
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Patent number 5,531,324
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Issue date Jul 2, 1996
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Showa Yuki Kabushiki Kaisha
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Shinichi Kosaki
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G11 - INFORMATION STORAGE
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Disc cartridge
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Patent number 4,799,123
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Issue date Jan 17, 1989
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Hitachi Maxell, Ltd.
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Yasunori Kanazawa
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G11 - INFORMATION STORAGE