Issued Patents 2019
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10415125 | Thick-wall oil-well steel pipe and production method thereof | Yuji Arai, Keiichi Kondo | 2019-09-17 |
| 10407758 | Steel for oil country tubular goods and method of producing the same | Tomohiko Omura, Yuji Arai, Kaori Kawano, Akihiro Sakamoto, Kazuo Okamura +3 more | 2019-09-10 |