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Akio Hayasaka
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Yamato, JP
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last 30 patents
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Patent Grant
Method of forming bipolar transistors with graft base regions
Patent number
4,640,721
Issue date
Feb 3, 1987
Hitachi, Ltd.
Keijiro Uehara
H01 - BASIC ELECTRIC ELEMENTS
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Patent Grant
Semiconductor integrated circuit device and method of producing same
Patent number
4,599,635
Issue date
Jul 8, 1986
Hitachi, Ltd.
Kazuo Itoh
H01 - BASIC ELECTRIC ELEMENTS
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Patent Grant
Method of manufacturing a semiconductor device
Patent number
4,260,430
Issue date
Apr 7, 1981
Hitachi, Ltd.
Kazuo Itoh
H01 - BASIC ELECTRIC ELEMENTS