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Youji Yamashita
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Yokohama, JP
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last 30 patents
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Patent Grant
Method and apparatus for manufacturing semi-insulation GaAs monocry...
Patent number
5,515,810
Issue date
May 14, 1996
Kabushiki Kaisha Toshiba
Youji Yamashita
C30 - CRYSTAL GROWTH
Information
Patent Grant
Method of manufacturing a semiconductor substrate
Patent number
5,389,551
Issue date
Feb 14, 1995
Kabushiki Kaisha Toshiba
Takanobu Kamakura
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Semiconductor crystal pulling method
Patent number
5,073,229
Issue date
Dec 17, 1991
Kabushiki Kaisha Toshiba
Youji Yamashita
C30 - CRYSTAL GROWTH
Information
Patent Grant
Crystal pulling apparatus and crystal pulling method
Patent number
5,034,200
Issue date
Jul 23, 1991
Kabushiki Kaisha Toshiba
Youji Yamashita
C30 - CRYSTAL GROWTH
Information
Patent Grant
Crystal pulling apparatus and crystal pulling method using the same
Patent number
5,021,225
Issue date
Jun 4, 1991
Kabushiki Kaisha Toshiba
Youji Yamashita
C30 - CRYSTAL GROWTH
Information
Patent Grant
Crystal pulling apparatus
Patent number
4,894,206
Issue date
Jan 16, 1990
Kabushiki Kaisha Toshiba
Youji Yamashita
C30 - CRYSTAL GROWTH