Kyoko Ishii

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Tokyo, JP

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Patents Grantslast 30 patents

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Dynamic Random Access Type Semiconductor Device
- Patent number 5,506,804
- Issue date Apr 9, 1996
- Hitachi, Ltd.
- Kazumasa Yanagisawa
- G11 - INFORMATION STORAGE
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Semiconductor integrated circuit device
- Patent number 5,440,521
- Issue date Aug 8, 1995
- Hitachi, Ltd.
- Manabu Tsunozaki
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Semiconductor IC device having a voltage conversion circuit which g...
- Patent number 5,426,616
- Issue date Jun 20, 1995
- Hitachi, Ltd.
- Kazuhiko Kajigaya
- G11 - INFORMATION STORAGE
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Semiconductor integrated circuit device with internal voltage drop...
- Patent number 5,335,203
- Issue date Aug 2, 1994
- Hitachi, Ltd.
- Kyoko Ishii
- G11 - INFORMATION STORAGE
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Testing method for a semiconductor memory device
- Patent number 5,276,648
- Issue date Jan 4, 1994
- Hitachi, Ltd.
- Kazumasa Yanagisawa
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Bi-CMOS semiconductor memory device, including improved layout stru...
- Patent number 5,150,325
- Issue date Sep 22, 1992
- Hitachi, Ltd.
- Kazumasa Yanagisawa
- G11 - INFORMATION STORAGE
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Semiconductor integrated circuit device
- Patent number 4,807,190
- Issue date Feb 21, 1989
- Hitachi Ltd.
- Kyoko Ishii
- G11 - INFORMATION STORAGE