Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861656 | Optical recording medium | Kenji Uchiyama, Hideki Ishizaki | 1989-08-29 |
| 4849304 | Optical recording medium | Kenji Uchiyama, Hideki Ishizaki, Hajime Utsunomiya | 1989-07-18 |
| 4837116 | Magnetic recording medium and recording/reproducing method therefor | Hiroyuki Arioka, Masaharu Nishimatsu | 1989-06-06 |
| 4835032 | Magnetic recording medium and recording/reproducing method therefor | Hiroyuki Arioka, Masaharu Nishimatsu | 1989-05-30 |
| 4828899 | Magnetic recording medium and recording/reproducing method thereof | Hiroyuki Arioka, Masaharu Nishimatsu | 1989-05-09 |