Issued Patents 1989
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885735 | Information recording and reproducing apparatus with management of defective sector | Yoshihisa Fukushima, Isao Satoh, Makoto Ichinose, Yuuji Takagi | 1989-12-05 |
| 4879704 | Optical disk, optical disk recording and reproducing apparatus and copy preventive method for optical disks | Yuuji Takagi, Isao Satoh, Makoto Ichinose, Yoshihisa Fukushima | 1989-11-07 |
| 4833663 | Information recording/reproducing apparatus for handling defective sectors on an optical disk | Isao Satoh, Makoto Ichinose, Yoshihisa Fukushima, Yuji Takagi | 1989-05-23 |
| 4823333 | Optical disk duplicating apparatus using sector data identification information for controlling duplication | Isao Satoh, Yoshihisa Fukushima, Makoto Ichinose, Yuji Takagi | 1989-04-18 |
| 4821254 | Information recording and reproducing apparatus which detects deterioration of a medium in each sector before recording | Isao Satoh, Yoshihisa Fukushima, Makoto Ichinose, Yuji Takagi | 1989-04-11 |
| 4805046 | Information recording and reproducing apparatus using sectors divided into a plurality of frames and having means for proper storage of the frame data | Isao Satoh, Makoto Ichinose, Yoshihisa Fukushima, Yuuji Takagi | 1989-02-14 |
| 4799208 | Optical recording and reproducing apparatus having erasing function with controllable erasing beam | Isao Satoh, Makoto Ichinose, Yoshihisa Fukushima, Yuuji Takagi | 1989-01-17 |