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Dynamic ram
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Patent number 4,947,373
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Issue date Aug 7, 1990
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Hitachi, Ltd.
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Yasunori Yamaguchi
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G11 - INFORMATION STORAGE
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Semiconductor device
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Patent number 4,893,157
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Issue date Jan 9, 1990
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Hitachi, Ltd.
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Kazuyuki Miyazawa
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H01 - BASIC ELECTRIC ELEMENTS
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Semiconductor memory
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Patent number 4,819,213
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Issue date Apr 4, 1989
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Hitachi, Ltd.
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Yasunori Yamaguchi
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G11 - INFORMATION STORAGE