Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10724636 | Combined oil ring | Masataka Kawasaki, Mamoru Miyamoto, Kenji Arai | 2020-07-28 |
| 10520085 | Combined oil ring | Yasuyuki Murata, Kenji Arai, Ryosuke Kamata, Kazumoto Takahashi, Toru Tsukui | 2019-12-31 |
| 9528606 | Combined oil ring | Kenji Arai, Kazutomo Takahashi | 2016-12-27 |
| 8240676 | Piston ring | Tomotaka Kariya, Makoto Tsuruta | 2012-08-14 |
| 7354045 | Oil ring | Tomoaki Abe, Keishi Nanno, Shiro Shibata | 2008-04-08 |
| 6726218 | Compression piston ring for use in internal combustion engine | Hideo Negishi, Hideyo Iwama | 2004-04-27 |
| 6682078 | Ring groove for oil ring with coil expander of piston | Nobuyuki Murakami, Taro Itoh | 2004-01-27 |
| 6547251 | Ring groove for oil ring with coil expander of piston | Nobuyuki Murakami, Taro Itoh | 2003-04-15 |