Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4575107 | Piston rings for internal combustion engine | — | 1986-03-11 |
KU
Koujiro Umegawa
Riken: 1 patents #679 of 1,824Top 40%
Overall (All Time): #3,991,839 of 4,157,543Top 100%
1
Patents All Time