Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880692 | Magnetic recording medium | Katsumi Ryoke, Masatoshi Takahashi, Akihiro Hashimoto, Tsutomu Okita | 1989-11-14 |
| 4812369 | Magnetic recording medium | Yasuyuki Yamada, Takahito Miyoshi | 1989-03-14 |