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Optical recording medium
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Patent number 8,075,974
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Issue date Dec 13, 2011
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Ricoh Company, Ltd.
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Hiroshi Deguchi
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G11 - INFORMATION STORAGE
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Optical recording medium
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Patent number 7,611,762
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Issue date Nov 3, 2009
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Ricoh Company, Ltd.
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Hiroshi Deguchi
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G11 - INFORMATION STORAGE
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Optical recording method
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Patent number 7,417,930
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Issue date Aug 26, 2008
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Ricoh Company, Ltd.
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Hajime Yuzurihara
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G11 - INFORMATION STORAGE
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Optical recording method
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Patent number 7,362,683
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Issue date Apr 22, 2008
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Ricoh Company, Ltd.
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Hajime Yuzurihara
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G11 - INFORMATION STORAGE
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Optical recording medium
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Patent number 7,063,875
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Issue date Jun 20, 2006
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Ricoh Company, Ltd.
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Hiroshi Deguchi
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G11 - INFORMATION STORAGE
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Optical information recording medium
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Patent number 6,391,417
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Issue date May 21, 2002
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Ricoh Company, Ltd.
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Hajime Yuzurihara
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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Optical information recording medium
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Patent number 6,177,167
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Issue date Jan 23, 2001
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Ricoh Company, Ltd.
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Hajime Yuzurihara
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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