Koji Nagahashi

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Thick-wall oil-well steel pipe and production method thereof
- Patent number 10,415,125
- Issue date Sep 17, 2019
- Nippon Steel Corporation
- Yuji Arai
- C21 - METALLURGY OF IRON
Information Patent Grant
Steel for oil country tubular goods and method of producing the same
- Patent number 10,407,758
- Issue date Sep 10, 2019
- Nippon Steel Corporation
- Tomohiko Omura
- C21 - METALLURGY OF IRON

Patents Applicationslast 30 patents

Information Patent Application
THICK-WALL OIL-WELL STEEL PIPE AND PRODUCTION METHOD THEREOF
- Publication number 20170292177
- Publication date Oct 12, 2017
- NIPPON STEEL & SUMITOMO METAL CORPORATION
- Yuji ARAI
- C21 - METALLURGY OF IRON
Information Patent Application
STEEL FOR OIL COUNTRY TUBULAR GOODS AND METHOD OF PRODUCING THE SAME
- Publication number 20150114527
- Publication date Apr 30, 2015
- NIPPON STEEL & SUMITOMO METAL CORPORATION
- Tomohiko Omura
- C21 - METALLURGY OF IRON