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Shigeo Hirai
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Shiga, JP
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last 30 patents
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Patent Grant
Process for preparing ferromagnetic particles comprising metallic iron
Patent number
4,456,475
Issue date
Jun 26, 1984
Hitachi Maxell, Ltd.
Shigeo Hirai
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Method for production of metal magnetic particles
Patent number
4,400,337
Issue date
Aug 23, 1983
Hitachi Maxell, Ltd.
Yukihiro Hayashi
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Process for preparing ferromagnetic particles comprising metallic iron
Patent number
4,390,361
Issue date
Jun 28, 1983
Hitachi Maxell, Ltd.
Toshinobu Sueyoshi
B22 - CASTING POWDER METALLURGY