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Content data judging apparatus
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Patent number 6,829,367
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Issue date Dec 7, 2004
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International Business Machines Corporation
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Kazuhara Toyokawa
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G06 - COMPUTING CALCULATING COUNTING
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Data hiding and extraction methods
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Patent number 6,512,835
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Issue date Jan 28, 2003
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International Business Machines Corporation
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Masayuki Numao
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G06 - COMPUTING CALCULATING COUNTING
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Data control system
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Patent number 6,230,268
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Issue date May 8, 2001
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International Business Machines Corporation
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Kunihiko Miwa
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G06 - COMPUTING CALCULATING COUNTING
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Data hiding and extraction methods
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Patent number 6,005,643
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Issue date Dec 21, 1999
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International Business Machines Corporation
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Norishige Morimoto
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G06 - COMPUTING CALCULATING COUNTING
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Power supply apparatus
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Patent number 5,132,891
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Issue date Jul 21, 1992
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International Business Machines Corporation
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Masaki Kobayashi
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H04 - ELECTRIC COMMUNICATION TECHNIQUE