Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889767 | Magnetic recording medium | Kenji Yokoyama, Masatoshi Nakayama, Toru Shimozawa, Kunihiro Ueda | 1989-12-26 |
| 4880687 | Magnetic recording medium | Kenji Yokoyama, Masatoshi Nakayama, Toru Shimozawa, Kunihiro Ueda | 1989-11-14 |
| 4816334 | Magnetic recording medium | Kenji Yokoyama, Masatoshi Nakayama, Kunihiro Ueda | 1989-03-28 |