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Earphone device
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Patent number 5,276,740
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Issue date Jan 4, 1994
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Sony Corporation
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Kiyofumi Inanaga
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Hearing aid
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Patent number 5,228,089
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Issue date Jul 13, 1993
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Sony Corporation
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Kiyofumi Inanaga
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Induction speaker
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Patent number 5,062,140
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Issue date Oct 29, 1991
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Sony Corporation
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Kiyofumi Inanaga
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Sound reproducing apparatus
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Patent number 5,022,486
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Issue date Jun 11, 1991
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Sony Corporation
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Masayoshi Miura
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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Diaphragm
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Patent number 4,726,443
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Issue date Feb 23, 1988
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Sony Corporation and Fujikura Ltd.
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Masana Ugaji
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H04 - ELECTRIC COMMUNICATION TECHNIQUE