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Nobuyoshi Yoshikawa
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Omiya, JP
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last 30 patents
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Patent Grant
Method of producing concrete composite pipe
Patent number
5,035,850
Issue date
Jul 30, 1991
Teikoku Hume Pipe Co., Ltd.
Nobuyoshi Yoshikawa
B28 - WORKING CEMENT, CLAY, OR STONE
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Patent Grant
Centrifugally molded concrete composite pipe
Patent number
4,976,291
Issue date
Dec 11, 1990
Teikoku Hume Pipe Co., Ltd.
Nobuyoshi Yoshikawa
B28 - WORKING CEMENT, CLAY, OR STONE