Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12241148 | Alloy material and oil-well seamless pipe | Yusaku Tomio, Masayuki Sagara | 2025-03-04 |
| 11891680 | Steel material suitable for use in sour environment | Yohei Otome, Hiroki Kamitani, Atsushi Soma, Taro OE, Nobuaki Komatsubara +1 more | 2024-02-06 |
| 10995394 | Steel bar for downhole member, and downhole member | Daisuke Matsuo, Takuji Nakahata, Hisashi Amaya, Tsutomu Okuyama | 2021-05-04 |
| 10246765 | Martensitic Cr-containing steel and oil country tubular goods | Tomohiko Omura, Yusaku Tomio, Toshio Mochizuki | 2019-04-02 |
| 10000832 | Duplex stainless steel | Hisashi Amaya, Kazuhiro Ogawa | 2018-06-19 |
| 9783876 | Stainless steel for oil wells and stainless steel pipe for oil wells | Shinjiro Nakatsuka, Taro Ohe, Hisashi Amaya, Yohei Otome, Yusaku Tomio +3 more | 2017-10-10 |
| 9555496 | Process for producing welded joint using GMA welding and CO2 as a shielding gas | Kenta Yamada, Masahiko Hamada, Daisuke Motoya, Shinjiro Nakatsuka, Hisashi Amaya | 2017-01-31 |
| 9322087 | Stainless steel for oil well, stainless steel pipe for oil well, and method of manufacturing stainless steel for oil well | Kunio Kondo, Hisashi Amaya, Taro Ohe, Yohei Otome | 2016-04-26 |
| 9303296 | High-strength stainless steel for oil well and high-strength stainless steel pipe for oil well | Taro Ohe, Hisashi Amaya, Kunio Kondo, Yohei Otome | 2016-04-05 |
| 9109268 | Stainless steel for oil well, stainless steel pipe for oil well, and method of manufacturing stainless steel for oil well | Kunio Kondo, Hisashi Amaya, Taro Ohe, Yohei Otome | 2015-08-18 |
| 8608872 | High-strength stainless steel pipe excellent in sulfide stress cracking resistance and high-temperature carbonic-acid gas corrosion resistance | Kunio Kondo, Hisashi Amaya, Taro Ohe | 2013-12-17 |
| 8163233 | Martensitic stainless steel for welded structures | Hisashi Amaya, Kazuhiro Ogawa, Akira Taniyama, Masakatsu Ueda | 2012-04-24 |
| 7799149 | Oil country tubular good for expansion in well and manufacturing method thereof | Taro Ohe, Keiichi Nakamura, Toshiharu Abe, Tomoki Mori, Masakatsu Ueda | 2010-09-21 |
| 6217676 | Steel for oil well pipe with high corrosion resistance to wet carbon dioxide and seawater, and a seamless oil well pipe | Masakatsu Ueda | 2001-04-17 |
| 5938865 | Process for producing high-strength seamless steel pipe having excellent sulfide stress cracking resistance | Kunio Kondo, Takahiro Kushida, Hajime Osako | 1999-08-17 |