Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871441 | Ion activity measuring device | Yuzo Tsunekawa, Takehiko Sato | 1989-10-03 |
HT
Hikaru Tsuruta
Overall (1989): #103,772 of 140,708Top 75%
1
Patents 1989