Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885189 | Method of producing magnetic recording media | Tadashi Yasunaga | 1989-12-05 |
| 4835068 | Magnetic recording medium | Yoshihiro Arai, Tadashi Yasunaga | 1989-05-30 |
RS
Ryuji Shirahata
Overall (1989): #16,503 of 140,708Top 15%
2
Patents 1989