Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4837081 | Magnetic recording medium | Yasuyuki Yamada, Tsutomu Okita, Nobuo Tsuji | 1989-06-06 |
| 4798755 | Magnetic recording medium | Yasuyuki Yamada | 1989-01-17 |
HM
Hajime Miyatsuka
Overall (1989): #26,552 of 140,708Top 20%
2
Patents 1989