Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11873780 | Combined oil ring | Masahiro Uchiumi, Kenji Arai, Makoto Kajiwara, Hajime Ando | 2024-01-16 |
| 9506138 | Piston ring | Hiroyuki Sugiura, Atsushi Chiba, Makoto Kajiwara, Kazuhiro Fujimura, Katsuaki Ogawa | 2016-11-29 |
| 7493882 | Combination of a cylinder liner and a piston ring | Iwao Hiraishi, Katsuaki Ogawa, Hiromi Ishikawa, Tsugane Hirase | 2009-02-24 |
| 5061861 | MOS integrated circuit for driving light-emitting diodes | Masaru Ohnishi | 1991-10-29 |