Issued Patents All Time
Showing 1–19 of 19 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6532995 | Super-high-strength line pipe excellent in low temperature toughness and production method thereof | Hitoshi Asahi, Takuya Hara, Yoshio Terada, Shigeru Ohkita, Kunio Koyama | 2003-03-18 |
| 6264760 | Ultra-high strength, weldable steels with excellent ultra-low temperature toughness | Hitoshi Asahi, Takuya Hara, Yoshio Terada, Michael J. Luton, Jayoung Koo +2 more | 2001-07-24 |
| 6248191 | Method for producing ultra-high strength, weldable steels with superior toughness | Michael J. Luton, Jayoung Koo, Narasimha-Rao Venkata Bangaru, Clifford W. Petersen, Hitoshi Asahi +2 more | 2001-06-19 |
| 6228183 | Ultra-high strength, weldable, boron-containing steels with superior toughness | Narasimha-Rao Venkata Bangaru, Jayoung Koo, Michael J. Luton, Clifford W. Petersen, Hitoshi Asahi +2 more | 2001-05-08 |
| 6224689 | Ultra-high strength, weldable, essentially boron-free steels with superior toughness | Jayoung Koo, Michael J. Luton, Narasimha-Rao Venkata Bangaru, Clifford W. Petersen, Hitoshi Asahi +2 more | 2001-05-01 |
| 5985053 | Steel having improved toughness in welding heat-affected zone | Takuya Hara, Hitoshi Asahi, Ryuji Uemori, Naoki Saito | 1999-11-16 |
| 5817275 | Steel plate having excellent corrosion resistance and sulfide stress cracking resistance | Hiroyuki Ogawa, Akihiko Takahashi, Hajime Ishikawa, Takuya Hara | 1998-10-06 |
| 5798004 | Weldable high strength steel having excellent low temperature toughness | Hitoshi Asahi, Takuya Hara, Yoshio Terada | 1998-08-25 |
| 5755895 | High strength line pipe steel having low yield ratio and excellent in low temperature toughness | Hitoshi Asahi, Takuya Hara, Yoshio Terada | 1998-05-26 |
| 5723089 | Line pipe metal arc welded with wire alloy | Rikio Chijiiwa, Hiroyuki Ogawa, Koichi Shinada, Yoshinori Ogata, Hajime Ishikawa +2 more | 1998-03-03 |
| 5716465 | High-corrosion-resistant martensitic stainless steel having excellent weldability and process for producing the same | Takuya Hara, Asahi Hitoshi, Taro Muraki, Akira Kawakami | 1998-02-10 |
| 5183198 | Method of producing clad steel plate having good low-temperature toughness | Yoshinori Ogata, Yoshio Terada | 1993-02-02 |
| 5147474 | Building construction steel having excellent fire resistance and low yield ratio | Rikio Chiziiwa, Yoshifumi Sakumoto, Kazuo Funato, Yuzuru Yoshida, Koichiro Keira | 1992-09-15 |
| 4990196 | Process for manufacturing building construction steel having excellent fire resistance and low yield ratio | Rikio Chiziiwa, Yoshifumi Sakumoto, Kazuo Funato, Yuzuru Yoshida, Koichiro Keira | 1991-02-05 |
| 4851052 | Method of producing steel plate with good low-temperature toughness | Koyoshi Nishioka, Masahiko Murata | 1989-07-25 |
| 4591396 | Method of producing steel having high strength and toughness | Hiroo Mazuda, Mamoru Ohashi, Yasumitsu Onoe, Shinogu Tamukai | 1986-05-27 |
| 4521258 | Method of making wrought high tension steel having superior low temperature toughness | Hiroo Mazuda, Mamoru Ohashi, Yasumitsu Onoe | 1985-06-04 |
| RE31251 | Process for producing a high tension steel sheet product having an excellent low-temperature toughness with a yield point of 40 kg/mm.sup.2 or higher | Hajime Nakasugi, Hiroaki Masui, Tetuo Takeda, Seiji Eiro | 1983-05-24 |
| 4219371 | Process for producing high-tension bainitic steel having high-toughness and excellent weldability | Hajime Nakasugi, Masana Imagumbai | 1980-08-26 |