Issued Patents All Time
Showing 1–25 of 36 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12305597 | Steel pipe for fuel injection pipe, and fuel injection pipe using same | Taizo Makino, Masahiro Yamazaki, Yuji Arai, Osamu Endo, Naoki Serizawa +1 more | 2025-05-20 |
| 10662497 | Austenitic stainless steel and method of manufacturing the same | Jun Nakamura, Hiroyuki Hirata, Kana JOTOKU, Takahiro Osuki | 2020-05-26 |
| 10556298 | Welded joint and method of manufacturing welded joint | Kana JOTOKU, Hiroyuki Hirata, Jun Nakamura, Takahiro Osuki | 2020-02-11 |
| 10407758 | Steel for oil country tubular goods and method of producing the same | Yuji Arai, Kaori Kawano, Akihiro Sakamoto, Kazuo Okamura, Kenji Yamamoto +3 more | 2019-09-10 |
| 10316383 | Austenitic stainless steel and method for producing the same | Etsuo Dan, Masaaki Terunuma, Takahiro Osuki, Jun Nakamura | 2019-06-11 |
| 10266909 | High-strength austenitic stainless steel for high-pressure hydrogen gas | Jun Nakamura, Hirokazu Okada, Hiroyuki Semba, Yusaku Tomio, Hiroyuki Hirata +3 more | 2019-04-23 |
| 10260125 | High-strength austenitic stainless steel for high-pressure hydrogen gas | Jun Nakamura, Hirokazu Okada, Hiroyuki Semba, Yusaku Tomio, Hiroyuki Hirata +3 more | 2019-04-16 |
| 10246765 | Martensitic Cr-containing steel and oil country tubular goods | Yusaku Tomio, Hideki Takabe, Toshio Mochizuki | 2019-04-02 |
| 10036078 | Low alloy oil well steel pipe and method for manufacturing same | Yuji Arai, Keiichi Kondo | 2018-07-31 |
| 9909198 | Method for producing a low alloy steel for oil country tubular goods having excellent sulfide stress cracking resistance | Yuji Arai, Kaori Kawano, Akihiro Sakamoto, Kazuo Okamura, Kenji Yamamoto +1 more | 2018-03-06 |
| 9783876 | Stainless steel for oil wells and stainless steel pipe for oil wells | Shinjiro Nakatsuka, Taro Ohe, Hisashi Amaya, Hideki Takabe, Yohei Otome +3 more | 2017-10-10 |
| 9777352 | Oil-well steel pipe having excellent sulfide stress cracking resistance | Atsushi Soma, Yuji Arai, Mitsuhiro Numata, Toru Takayama, Masanao Seo | 2017-10-03 |
| 9546408 | Quenching method for steel pipe | Akihiro Sakamoto, Kazuo Okamura, Kenji Yamamoto, Yuji Arai | 2017-01-17 |
| 9211601 | Austenitic steel welded joint | Hiroyuki Hirata, Yusaku Tomio, Jun Nakamura | 2015-12-15 |
| 9175371 | Steel for steel tube with excellent sulfide stress cracking resistance | Mitsuhiro Numata, Masayuki Morimoto, Toru Takayama, Atsushi Soma | 2015-11-03 |
| 9017494 | Method for producing seamless steel pipe for oil wells excellent in sulfide stress cracking resistance | Yuji Arai, Keiichi Nakamura | 2015-04-28 |
| 8696835 | Austenitic stainless steel for hydrogen gas and a method for its manufacture | Hiroyuki Semba, Masaaki Igarashi, Mitsuo Miyahara, Kazuhiko Ogawa | 2014-04-15 |
| 8663400 | Low alloy steel for high-pressure hydrogen gas environment and container for high-pressure hydrogen | Mitsuo Miyahara, Hiroyuki Semba, Masaaki Igarashi | 2014-03-04 |
| 8617462 | Steel for oil well pipe excellent in sulfide stress cracking resistance | — | 2013-12-31 |
| 8262767 | Method of producing steel for steel pipe excellent in sour-resistance performance | Mitsuhiro Numata, Shingo Takeuchi | 2012-09-11 |
| 8168010 | Low alloy steel for oil well pipes having excellent sulfide stress cracking resistance | Kenji Kibayashi | 2012-05-01 |
| 7959709 | Method of producing steel for steel pipe excellent in sour-resistance performance | Mitsuhiro Numata, Shingo Takeuchi | 2011-06-14 |
| 7896984 | Method for manufacturing seamless steel pipe for line pipe | Kenji Kobayashi, Kunio Kondo, Yuji Arai, Nobuyuki Hisamune | 2011-03-01 |
| 7749431 | Stainless steel for high-pressure hydrogen gas | Masaaki Igarashi, Hiroyuki Semba, Mitsuo Miyahara, Kazuhiro Ogawa | 2010-07-06 |
| 7670547 | Low alloy steel for oil country tubular goods having high sulfide stress cracking resistance | Kenji Kobayashi | 2010-03-02 |