Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9090957 | Martensitic stainless steel oil country tubular good | Hisashi Amaya, Kunio Kondo | 2015-07-28 |
| 8163233 | Martensitic stainless steel for welded structures | Hisashi Amaya, Kazuhiro Ogawa, Akira Taniyama, Hideki Takabe | 2012-04-24 |
| 8157930 | Martensitic stainless steel | Hisashi Amaya, Kunio Kondo, Keiichi Nakamura, Takahiro Kushida | 2012-04-17 |
| 7799149 | Oil country tubular good for expansion in well and manufacturing method thereof | Taro Ohe, Keiichi Nakamura, Hideki Takabe, Toshiharu Abe, Tomoki Mori | 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 | Hideki Takabe | 2001-04-17 |
| 6159311 | Martensitic stainless steel pipe and method for manufacturing the same | Hisashi Amaya, Kunio Kondo | 2000-12-12 |
| 6129999 | High-strength welded steel structures having excellent corrosion resistance | Kazuhiro Ogawa, Kunio Kondo, Masaaki Igarashi | 2000-10-10 |
| 6059175 | Method for joining metallic materials by diffusion bonding and joined structure thereby | Masahiko Hamada, Yasuto Fukada, Yuuichi Komizo | 2000-05-09 |
| 6024276 | Method for bonding dual-phase stainless steel | Hiroyuki Hirata, Yuuichi Komizo, Yasuto Fukada | 2000-02-15 |
| 5879619 | Hydrogen sulfide corrosion resistant high-Cr and high-Ni alloys | — | 1999-03-09 |
| 5849111 | Duplex stainless steel | Masaaki Igarashi, Kunio Kondo, Kazuhiro Ogawa, Tomoki Mori | 1998-12-15 |
| 5660211 | Galvanic corrosion resistant insulating pipe having excellent film adhesion | Nobuhiko Hiraide, Toshiro Anraku | 1997-08-26 |
| 5383983 | Martensitic stainless steel suitable for use in oil wells | Kunio Kondo, Takahiro Kushida | 1995-01-24 |