Issued Patents 2021
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11186885 | High-strength seamless steel pipe for oil country tubular goods, and production method for high-strength seamless steel pipe for oil country tubular goods | Masao Yuga, Hiroki Ota | 2021-11-30 |
| 11111566 | Low alloy high strength seamless steel pipe for oil country tubular goods | Masao Yuga, Hiroki Ota, Kazuki Fujimura | 2021-09-07 |
| 10975450 | Low alloy high strength thick-walled seamless steel pipe for oil country tubular goods | Masao Yuga, Kenichiro Eguchi, Haruo Nakamichi | 2021-04-13 |
| 10920297 | High-strength seamless steel pipe for oil country tubular goods and method of producing the same | Masao Yuga, Yasuhide Ishiguro, Seiji Nabeshima, Hiroki Ota | 2021-02-16 |