Masayoshi Hayakawa

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Hitachi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Insulated type switching device
- Patent number RE37244
- Issue date Jun 26, 2001
- Hitachi, Ltd.
- Tooru Tanimizu
- 218 - High-voltage switches with arc preventing or extinguishing devices
Information Patent Grant
Insulated type switchgear device
- Patent number 6,005,213
- Issue date Dec 21, 1999
- Hitachi, Ltd.
- Ayumu Morita
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Vacuum type switch gear device having L shaped stationary and movab...
- Patent number 5,952,636
- Issue date Sep 14, 1999
- Hitachi, Ltd.
- Ayumu Morita
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Insulated type switching device
- Patent number 5,719,365
- Issue date Feb 17, 1998
- Hitachi, Ltd.
- Tooru Tanimizu
- H01 - BASIC ELECTRIC ELEMENTS