Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885735 | Information recording and reproducing apparatus with management of defective sector | Yoshihisa Fukushima, Isao Satoh, Makoto Ichinose, Yuzuru Kuroki | 1989-12-05 |
| 4879704 | Optical disk, optical disk recording and reproducing apparatus and copy preventive method for optical disks | Isao Satoh, Makoto Ichinose, Yoshihisa Fukushima, Yuzuru Kuroki | 1989-11-07 |
| 4805046 | Information recording and reproducing apparatus using sectors divided into a plurality of frames and having means for proper storage of the frame data | Yuzuru Kuroki, Isao Satoh, Makoto Ichinose, Yoshihisa Fukushima | 1989-02-14 |
| 4799208 | Optical recording and reproducing apparatus having erasing function with controllable erasing beam | Isao Satoh, Makoto Ichinose, Yoshihisa Fukushima, Yuzuru Kuroki | 1989-01-17 |