Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884152 | Method for restoring track 0 | — | 1989-11-28 |
| 4876618 | Method for detecting zero track | Tomoo Iizumi | 1989-10-24 |
| 4860131 | Method for recorrecting head position in a disk drive | Toru Kowaguchi, Tooru Kaneko, Tomoo Iizumi | 1989-08-22 |
| 4839753 | Information recording disk | Tomoo Iizumi, Yoshitaka Takahashi, Hiroshi Yoshida, Tooru Kaneko, Yuichi Hishi | 1989-06-13 |