Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869797 | Method for preparing a magnetic recording medium | Makoto Nagao, Fusao Yamanaka, Akira Nahara | 1989-09-26 |
| 4840843 | Magnetic recording medium | Makoto Nagao, Akira Nahara, Yasuo Nishikawa, Hiroyuki Iwasaki | 1989-06-20 |