Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4863533 | Apex seal for rotary piston engine and method for manufacturing the same | Katsunori Hanakawa, Ken-ichi Okazaki | 1989-09-05 |
YU
Yasuo Uosaki
Overall (1989): #41,647 of 140,708Top 30%
1
Patents 1989