Issued Patents All Time
Showing 1–19 of 19 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12428712 | Martensitic stainless steel material | Daisuke Matsuo | 2025-09-30 |
| 12385118 | Duplex stainless seamless steel pipe and method for producing duplex stainless seamless steel pipe | Kosei KATO | 2025-08-12 |
| 12371765 | Seamless steel pipe suitable for use in sour environment | Seiya OKADA, Hiroki Kamitani, Nobuaki Komatsubara, Shohei Ikeda, Naoya Shirasawa | 2025-07-29 |
| 12241148 | Alloy material and oil-well seamless pipe | Hideki Takabe, Masayuki Sagara | 2025-03-04 |
| 12043885 | Seamless steel pipe and method for producing the same | Daisuke Matsuo | 2024-07-23 |
| 11970759 | Martensitic stainless seamless steel pipe | Kyohei KANKI, Masayuki Sagara, Daisuke Matsuo | 2024-04-30 |
| 11965232 | Martensitic stainless seamless steel pipe | Kyohei KANKI, Masayuki Sagara | 2024-04-23 |
| 11834725 | Martensitic stainless steel material | Daisuke Matsuo | 2023-12-05 |
| 11807910 | Austenitic alloy pipe and method for producing same | Masaki Ueyama, Yuhei Suzuki | 2023-11-07 |
| 11286545 | Cr-Ni alloy and seamless steel pipe made of Cr-Ni alloy | Akiko Tomio, Masaki Ueyama | 2022-03-29 |
| 10597760 | High-strength steel material for oil well and oil well pipes | Kenji Kobayashi | 2020-03-24 |
| 10557574 | Ni—Cr alloy material and seamless oil country tubular goods using the same | Masayuki Sagara | 2020-02-11 |
| 10513761 | High-strength steel material for oil well and oil country tubular goods | Kenji Kobayashi | 2019-12-24 |
| 10378079 | Stainless steel and stainless steel product for oil well | Hiroshi KAIDO | 2019-08-13 |
| 10266909 | High-strength austenitic stainless steel for high-pressure hydrogen gas | Tomohiko Omura, Jun Nakamura, Hirokazu Okada, Hiroyuki Semba, Hiroyuki Hirata +3 more | 2019-04-23 |
| 10260125 | High-strength austenitic stainless steel for high-pressure hydrogen gas | Tomohiko Omura, Jun Nakamura, Hirokazu Okada, Hiroyuki Semba, Hiroyuki Hirata +3 more | 2019-04-16 |
| 10246765 | Martensitic Cr-containing steel and oil country tubular goods | Tomohiko Omura, Hideki Takabe, Toshio Mochizuki | 2019-04-02 |
| 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 |
| 9211601 | Austenitic steel welded joint | Hiroyuki Hirata, Tomohiko Omura, Jun Nakamura | 2015-12-15 |