Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4857388 | Magnetic recording medium | Hiroshi Ogawa | 1989-08-15 |
| 4847147 | Magnetic recording medium | Masashi Aonuma, Masaaki Suzuki | 1989-07-11 |
| 4820581 | Magnetic recording medium | Shinji Saito, Hiroshi Ogawa, Akihiro Matsufuji | 1989-04-11 |
| 4803120 | Magnetic tape having a leader tape | Hiroshi Ogawa, Chiaki Mizuno | 1989-02-07 |