Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |
| 9783876 | Stainless steel for oil wells and stainless steel pipe for oil wells | Shinjiro Nakatsuka, Taro Ohe, Hisashi Amaya, Hideki Takabe, Yohei Otome +3 more | 2017-10-10 |
| 9777352 | Oil-well steel pipe having excellent sulfide stress cracking resistance | Atsushi Soma, Tomohiko Omura, Yuji Arai, Mitsuhiro Numata, Toru Takayama | 2017-10-03 |
| 9267186 | Method for quenching steel pipe and method for producing steel pipe using the same | — | 2016-02-23 |