Issued Patents 1989
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869797 | Method for preparing a magnetic recording medium | Makoto Nagao, Kunihiko Sano, Fusao Yamanaka | 1989-09-26 |
| 4867101 | Apparatus for producing magnetic recording medium | Fusao Yamanaka, Makoto Nagao | 1989-09-19 |
| 4868070 | Vertical magnetization type recording medium and manufacturing method therefor | Makoto Nagao, Fusao Yamanaka | 1989-09-19 |
| 4865878 | Method of manufacturing vertical magnetization type recording medium | Makoto Nagao, Fusao Yamanaka | 1989-09-12 |
| 4840843 | Magnetic recording medium | Kunihiko Sano, Makoto Nagao, Yasuo Nishikawa, Hiroyuki Iwasaki | 1989-06-20 |
| 4837118 | Magneto-optical recording medium | Ryoichi Yamamoto, Masaaki Nomura, Takashi Yamada | 1989-06-06 |
| 4808456 | Magneto-optical recording medium and method of making the same | Takashi Yamada, Masaaki Nomura, Ryoichi Yamamoto | 1989-02-28 |
| 4802160 | Optical disk substrate | Takashi Yamada, Masaaki Nomura, Ryoichi Yamamoto | 1989-01-31 |