Issued Patents All Time
Showing 1–25 of 25 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10995394 | Steel bar for downhole member, and downhole member | Daisuke Matsuo, Takuji Nakahata, Tsutomu Okuyama, Hideki Takabe | 2021-05-04 |
| 10000832 | Duplex stainless steel | Hideki Takabe, Kazuhiro Ogawa | 2018-06-19 |
| 9783876 | Stainless steel for oil wells and stainless steel pipe for oil wells | Shinjiro Nakatsuka, Taro Ohe, Hideki Takabe, Yohei Otome, Yusaku Tomio +3 more | 2017-10-10 |
| 9771628 | Duplex stainless steel and production method therefor | Daisuke Motoya, Masahiko Hamada, Hiroyuki Nagayama, Kenta Yamada | 2017-09-26 |
| 9579870 | Welded joint of duplex stainless steel | Hiroyuki Nagayama, Kenta Yamada, Masahiko Hamada, Daisuke Motoya | 2017-02-28 |
| 9555496 | Process for producing welded joint using GMA welding and CO2 as a shielding gas | Kenta Yamada, Masahiko Hamada, Daisuke Motoya, Shinjiro Nakatsuka, Hideki Takabe | 2017-01-31 |
| 9322087 | Stainless steel for oil well, stainless steel pipe for oil well, and method of manufacturing stainless steel for oil well | Hideki Takabe, Kunio Kondo, 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, Hideki Takabe, 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 | Hideki Takabe, Kunio Kondo, Taro Ohe, Yohei Otome | 2015-08-18 |
| 9090957 | Martensitic stainless steel oil country tubular good | Kunio Kondo, Masakatsu Ueda | 2015-07-28 |
| 9034125 | Method for manufacturing Ni base alloy pipe stock | Masaaki Igarashi, Kazuhiro Shimoda, Tomio Yamakawa | 2015-05-19 |
| 8784581 | Fe-Ni alloy pipe stock and method for manufacturing the same | Masaaki Igarashi, Kazuhiro Shimoda, Tomio Yamakawa | 2014-07-22 |
| 8701455 | Method for manufacturing a high alloy pipe | Masayuki Sagara, Hitoshi Suwabe, Shigemitsu Kimura, Masaaki Igarashi | 2014-04-22 |
| 8608872 | High-strength stainless steel pipe excellent in sulfide stress cracking resistance and high-temperature carbonic-acid gas corrosion resistance | Kunio Kondo, Hideki Takabe, Taro Ohe | 2013-12-17 |
| 8163233 | Martensitic stainless steel for welded structures | Kazuhiro Ogawa, Akira Taniyama, Masakatsu Ueda, Hideki Takabe | 2012-04-24 |
| 8157930 | Martensitic stainless steel | Kunio Kondo, Masakatsu Ueda, Keiichi Nakamura, Takahiro Kushida | 2012-04-17 |
| 8071020 | High strength Cr-Ni alloy material and seamless pipe for oil well | Yohei Otome, Masaaki Igarashi, Hirokazu Okada | 2011-12-06 |
| 7767039 | Martensitic stainless steel | Kunio Kondo | 2010-08-03 |
| 7458426 | Steel pipe for embedding-expanding, and method of embedding-expanding oil well steel pipe | Yuji Arai, Kunio Kondo, Akihito Yamane | 2008-12-02 |
| 7238434 | Welded structure having improved resistance to stress corrosion cracking | Kazuhiro Ogawa, Kunio Kondo, Masayuki Sagara, Hiroyuki Hirata | 2007-07-03 |
| 7225868 | Steel pipe for embedding-expanding, and method of embedding-expanding oil well steel pipe | Yuji Arai, Kunio Kondo, Akihito Yamane | 2007-06-05 |
| 7082992 | Oil well steel pipe for embedding-expanding | Yuji Arai | 2006-08-01 |
| 6440234 | Martensitic stainless steel products | Toshiro Anraku, Yasuyoshi Hidaka | 2002-08-27 |
| 6210806 | Martensitic stainless steel having oxide scale layers | Yasuyoshi Hidaka, Toshiro Anraku | 2001-04-03 |
| 6159311 | Martensitic stainless steel pipe and method for manufacturing the same | Masakatsu Ueda, Kunio Kondo | 2000-12-12 |