Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4837116 | Magnetic recording medium and recording/reproducing method therefor | Hiroyuki Arioka, Suguru Takayama | 1989-06-06 |
| 4835032 | Magnetic recording medium and recording/reproducing method therefor | Hiroyuki Arioka, Suguru Takayama | 1989-05-30 |
| 4828899 | Magnetic recording medium and recording/reproducing method thereof | Hiroyuki Arioka, Suguru Takayama | 1989-05-09 |
| 4810555 | Magnetic recording medium | Toru Shimozawa, Shigeyo Miyamori | 1989-03-07 |