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Ryoji Hirai
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Mobara, JP
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last 30 patents
Information
Patent Grant
Color cathode ray tube of shadow mask type
Patent number
5,606,217
Issue date
Feb 25, 1997
Hitachi, Ltd.
Ryoji Hirai
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Color picture tube with flat appearing face plate
Patent number
4,943,754
Issue date
Jul 24, 1990
Hitachi, Ltd.
Ryoji Hirai
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Color picture tube of shadow mask type with particular faceplate pa...
Patent number
4,924,140
Issue date
May 8, 1990
Hitachi, Ltd.
Ryoji Hirai
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Color picture tube shadow mask material
Patent number
4,754,188
Issue date
Jun 28, 1988
Hitachi, Ltd.
Rikizo Watanabe
C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information
Patent Grant
Color picture tube with shadow mask
Patent number
4,713,576
Issue date
Dec 15, 1987
Hitachi, Ltd.
Akira Misumi
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Color picture tube for character display
Patent number
4,475,056
Issue date
Oct 2, 1984
Hitachi, Ltd.
Ryoji Hirai
H01 - BASIC ELECTRIC ELEMENTS