Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10124992 | Endless handrail manufacturing method, endless handrail and escalator | Hidetoshi Takeyama, Fumiya Murata | 2018-11-13 |
| 9441695 | High cleanliness spring steel and high cleanliness spring excellent in fatigue properties | Tomoko Sugimura, Sei Kimura, Koichi Sakamoto, Takeshi Inoue | 2016-09-13 |
| 8900381 | Spring steel and spring superior in fatigue properties | Tomoko Sugimura, Koichi Sakamoto, Kei MASUMOTO | 2014-12-02 |
| 8613809 | High cleanliness spring steel and high cleanliness spring excellent in fatigue properties | Tomoko Sugimura, Sei Kimura, Koichi Sakamoto, Takeshi Inoue | 2013-12-24 |
| 8187530 | Steel for high-cleanliness spring with excellent fatigue characteristics and high-cleanliness spring | Tomoko Sugimura, Koichi Sakamoto, Yoshio Fukuzaki, Takeshi Inoue | 2012-05-29 |
| 8052925 | Low carbon resulfurized free-machining steel having high machinability | Koichi Sakamoto, Hiroshi Yaguchi, Goro Anan, Yoshiteru Fukuoka | 2011-11-08 |
| 7615099 | Method for producing high cleanness steel excellent in fatigue strength or cold workability | Koichi Sakamoto, Tomoko Sugimura, Yoshio Fukuzaki, Sumie Suda | 2009-11-10 |
| 7608130 | Method for producing high cleanliness steel excellent in fatigue strength or cold workability | Koichi Sakamoto, Tomoko Sugimura, Yoshio Fukuzaki, Sumie Suda | 2009-10-27 |
| 7429301 | Ultra clean spring steel | Tomoko Sugimura, Koichi Sakamoto, Sumie Suda | 2008-09-30 |