Akira Yamaguchi

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Patents Grantslast 30 patents

Information Patent Grant
Silicon nitride ceramic sliding material and process for producing...
- Patent number 5,922,629
- Issue date Jul 13, 1999
- Sumitomo Electric Industries, Ltd.
- Jin-Joo Park
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Process for the production of silicon nitride sintered body
- Patent number 5,827,472
- Issue date Oct 27, 1998
- Sumitomo Electric Industries, Ltd.
- Masashi Yoshimura
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES