Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889767 | Magnetic recording medium | Kenji Yokoyama, Masatoshi Nakayama, Toru Shimozawa, Fumio Maruta | 1989-12-26 |
| 4880687 | Magnetic recording medium | Kenji Yokoyama, Masatoshi Nakayama, Toru Shimozawa, Fumio Maruta | 1989-11-14 |
| 4863811 | Magnetic recording medium and method of making | Masatoshi Nakayama | 1989-09-05 |
| 4844978 | Magnetic recording medium | Masatoshi Nakayama, Yasufumi Takasugi | 1989-07-04 |
| 4824724 | Magnetic recording medium | Yasufumi Takasugi, Masatoshi Nakayama | 1989-04-25 |
| 4816334 | Magnetic recording medium | Kenji Yokoyama, Masatoshi Nakayama, Fumio Maruta | 1989-03-28 |