Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5343702 | Zeolite converter for diesel engine | Kiyoshi Miyajima, Hiroshi Oikawa, Yasuaki Kumagai, Shinji Nakayama, Hiroshi Nakagawa +1 more | 1994-09-06 |
| 4974414 | Particulate purging apparatus for diesel engine exhaust | Yasuaki Kumagai, Nobuaki Takeda, Hiroshi Ogita | 1990-12-04 |
| 4881959 | Exhaust emission purifier for diesel engines | Yasuaki Kumagai, Nobuaki Takeda, Hiroshi Ogita | 1989-11-21 |