Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4848212 | Internal combustion engine piston with two compression rings having reduced oil consumption | Tamenori Kawano, Atsushi Nakazawa, Takasi Nagano | 1989-07-18 |
KS
Kiyomi Sumida
Overall (1989): #86,931 of 140,708Top 65%
1
Patents 1989