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Kazushi Maruyama
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Kitakyushu, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Pipe joint
Patent number
6,705,648
Issue date
Mar 16, 2004
Nippon Steel Corporation
Kazushi Maruyama
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information
Patent Grant
Oil well pipe threaded joint
Patent number
6,176,524
Issue date
Jan 23, 2001
Nippon Steel Corporation
Eiji Tsuru
E21 - EARTH DRILLING MINING
Information
Patent Grant
Method of cooling steel pipes
Patent number
4,421,575
Issue date
Dec 20, 1983
Nippon Steel Corporation
Kyohei Murata
C21 - METALLURGY OF IRON