Issued Patents All Time
Showing 1–25 of 26 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12252756 | High-strength seamless steel pipe and method for manufacturing same | Masao Yuga, Toshiharu Hirama | 2025-03-18 |
| 12227815 | Seamless steel pipe having desirable sulfuric acid dew-point corrosion resistance, and method for manufacturing same | Masao Yuga, Hiroyuki Takai, Yasumasa Takemura | 2025-02-18 |
| 12227816 | High-strength seamless steel pipe and method for manufacturing same | Masao Yuga, Toshiharu Hirama | 2025-02-18 |
| 12129954 | Seamless steel pipe having desirable sulfuric acid dew-point corrosion resistance, and method for manufacturing same | Hiroyuki Takai, Yasumasa Takemura, Tatsuo Koide | 2024-10-29 |
| 11505842 | Low-alloy high-strength seamless steel pipe for oil country tubular goods | Masao Yuga, Yoichi Ito | 2022-11-22 |
| 11453924 | Low-alloy high-strength seamless steel pipe for oil country tubular goods | Masao Yuga, Yoichi Ito | 2022-09-27 |
| 11414733 | Low-alloy high-strength seamless steel pipe for oil country tubular goods | Masao Yuga, Yoichi Ito | 2022-08-16 |
| 11313007 | High-strength seamless steel pipe for oil country tubular goods, and method for producing the same | Masao Yuga | 2022-04-26 |
| 11186885 | High-strength seamless steel pipe for oil country tubular goods, and production method for high-strength seamless steel pipe for oil country tubular goods | Masao Yuga, Hiroki Ota | 2021-11-30 |
| 11111566 | Low alloy high strength seamless steel pipe for oil country tubular goods | Masao Yuga, Hiroki Ota, Kazuki Fujimura | 2021-09-07 |
| 10975450 | Low alloy high strength thick-walled seamless steel pipe for oil country tubular goods | Masao Yuga, Kenichiro Eguchi, Haruo Nakamichi | 2021-04-13 |
| 10920297 | High-strength seamless steel pipe for oil country tubular goods and method of producing the same | Masao Yuga, Yasuhide Ishiguro, Seiji Nabeshima, Hiroki Ota | 2021-02-16 |
| 10876182 | High-strength seamless steel pipe for oil country tubular goods and method of producing the same | Masao Yuga, Yasuhide Ishiguro, Seiji Nabeshima, Hiroki Ota | 2020-12-29 |
| 10844453 | High-strength seamless steel pipe for oil country tubular goods and method of producing the same | Masao Yuga, Yasuhide Ishiguro, Seiji Nabeshima, Hiroki Ota | 2020-11-24 |
| 10640856 | High-strength seamless steel pipe for oil country tubular goods and method of producing the same | Masao Yuga, Yasuhide Ishiguro, Kazuki Fujimura | 2020-05-05 |
| 10472690 | High-strength seamless steel pipe for oil country tubular goods and method of producing the same | Masao Yuga, Kazuki Fujimura, Yasuhide Ishiguro | 2019-11-12 |
| 9995669 | Round bar tensile test specimen for sulfide stress corrosion cracking test of a steel, test method for sulfide stress corrosion cracking of steel, and seamless steel pipe having excellent resistance to sulfide stress corrosion cracking | Masao Yuga, Yasuhide Ishiguro, Kazuki Fujimura, Yoshiyuki Sugano | 2018-06-12 |
| 9896748 | Low yield ratio dual phase steel linepipe with superior strain aging resistance | Jayoung Koo, Narasimha-Rao Venkata Bangaru, Hyun-Woo Jin, Adnan Ozekcin, Raghavan Ayer +7 more | 2018-02-20 |
| 8765269 | High strength steel pipe for low-temperature usage having excellent buckling resistance and toughness of welded heat affected zone and method for producing the same | Junji Shimamura, Nobuyuki Ishikawa, Nobuo Shikanai | 2014-07-01 |
| 8758528 | High-strength steel plate, method of producing the same, and high-strength steel pipe | Junji Shimamura, Shigeru Endo | 2014-06-24 |
| 8124247 | High-strength welded steel pipe including weld metal having high cold-cracking resistance and method for manufacturing the same | Naoya Hayakawa, Fumimaru Kawabata, Shuichi Sakaguchi, Makoto Ota, Shigeki Nishiyama +2 more | 2012-02-28 |
| 6521057 | High-strength high-toughness steel products | Noritsugu Itakura, Fumimaru Kawabata, Keniti Amano | 2003-02-18 |
| 6299710 | Method of producing a bainite steel product | Noritsugu Itakura, Fumimaru Kawabata, Keniti Amano | 2001-10-09 |
| 5989366 | Method of manufacturing thick steel product of high strength and high toughness having excellent weldability and minimal variation of structure and physical properties | Tohru Hayashi, Fumimaru Kawabata, Keniti Amano | 1999-11-23 |
| 5900076 | Bainitic steel materials having a less scattering of properties and method of producing the same | Tohru Hayashi, Keniti Amano, Kenji Oi, Fumimaru Kawabata, Tomoya Koseki +2 more | 1999-05-04 |