Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8007716 | Steel wire for high strength spring excellent in workability and high strength | Nobuhiko Ibaraki, Noritoshi Takamura, Naoki Terakado, Satoru Tendo, Tadayoshi Fujiwara +1 more | 2011-08-30 |
| 7763123 | Spring produced by a process comprising coiling a hard drawn steel wire excellent in fatigue strength and resistance to setting | Nobuhiko Ibaraki, Nao Yoshihara, Shigetsugu Yoshida, Koji Harada | 2010-07-27 |
| 7615099 | Method for producing high cleanness steel excellent in fatigue strength or cold workability | Koichi Sakamoto, Tomoko Sugimura, Atsuhiko Yoshida, Yoshio Fukuzaki | 2009-11-10 |
| 7615186 | Spring steel excellent in sag resistance and fatigue property | Nobuhiko Ibaraki | 2009-11-10 |
| 7608130 | Method for producing high cleanliness steel excellent in fatigue strength or cold workability | Koichi Sakamoto, Tomoko Sugimura, Atsuhiko Yoshida, Yoshio Fukuzaki | 2009-10-27 |
| 7597768 | Steel wire for hard drawn spring excellent in fatigue strength and resistance to settling, and hard drawn spring and method of making thereof | Nobuhiko Ibaraki, Nao Yoshihara, Shigetsugu Yoshida, Koji Harada | 2009-10-06 |
| 7429301 | Ultra clean spring steel | Tomoko Sugimura, Koichi Sakamoto, Atsuhiko Yoshida | 2008-09-30 |
| 7074282 | Steel wire rod for hard drawn spring, drawn wire rod for hard drawn spring and hard drawn spring, and method for producing hard drawn spring | Nobuhiko Ibaraki, Atushi Inada, Noritoshi Takamura, Satoru Tendoh, Tadayoshi Fujiwara +1 more | 2006-07-11 |