Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12241148 | Alloy material and oil-well seamless pipe | Hideki Takabe, Yusaku Tomio | 2025-03-04 |
| 11970759 | Martensitic stainless seamless steel pipe | Kyohei KANKI, Yusaku Tomio, Daisuke Matsuo | 2024-04-30 |
| 11965232 | Martensitic stainless seamless steel pipe | Kyohei KANKI, Yusaku Tomio | 2024-04-23 |
| 11066719 | Duplex stainless steel and method of manufacturing duplex stainless steel | Daisuke Motoya, Hidenori Shitamoto | 2021-07-20 |
| 11041232 | Austenitic stainless steel and production method therefor | Masahiro Seto, Kenta Yamada, Takahiro Osuki | 2021-06-22 |
| 10557574 | Ni—Cr alloy material and seamless oil country tubular goods using the same | Yusaku Tomio | 2020-02-11 |
| 10280487 | High alloy for oil well | Akiko Tomio | 2019-05-07 |
| 10202675 | Duplex stainless steel | Akiko Tomio | 2019-02-12 |
| 8701455 | Method for manufacturing a high alloy pipe | Hitoshi Suwabe, Hisashi Amaya, Shigemitsu Kimura, Masaaki Igarashi | 2014-04-22 |
| 8245552 | Process for producing high-alloy seamless tube | Hiroaki Murakami, Tomio Yamakawa, Tadashi Douhara | 2012-08-21 |
| 7238434 | Welded structure having improved resistance to stress corrosion cracking | Hisashi Amaya, Kazuhiro Ogawa, Kunio Kondo, Hiroyuki Hirata | 2007-07-03 |
| 6171547 | Austenitic stainless steel having excellent sulfuric acid corrosion resistance and excellent workability | Shigeki Azuma, Haruhiko Kajimura | 2001-01-09 |