Issued Patents 1989
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886703 | Magnetic recording medium | Kazuo Hasumi, Hideomi Watanabe, Katsumi Ryoke, Hideaki Kosha | 1989-12-12 |
| 4880693 | Magnetic recording medium | Katsumi Ryoke, Masatoshi Takahashi, Akihiro Hashimoto, Takashi Yoneyama | 1989-11-14 |
| 4880692 | Magnetic recording medium | Katsumi Ryoke, Masatoshi Takahashi, Akihiro Hashimoto, Kazuko Hanai | 1989-11-14 |
| 4874636 | Method for preparing magnetic recording medium | Hiromi Nakahara, Hiroshi Ogawa | 1989-10-17 |
| 4873138 | Metallic thin film type magnetic recording medium | — | 1989-10-10 |
| 4837081 | Magnetic recording medium | Yasuyuki Yamada, Hajime Miyatsuka, Nobuo Tsuji | 1989-06-06 |
| 4812351 | Magnetic recording medium | Masashi Aonuma, Hiroshi Hashimoto | 1989-03-14 |
| 4810435 | Method of making substrate for magnetic recording medium | Koh Kamada, Hiroshi Hashimoto | 1989-03-07 |
| 4800458 | Recording sheet bonded to a substrate in a magnetic disk | — | 1989-01-24 |