Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875987 | Grooved magnetic substrates and method for producing the same | Toshiaki Wada, Yoshiaki Katsuyama | 1989-10-24 |
| 4816128 | Process for producing substrate member for magnetic recording disc | Toshiaki Wada, Takayuki Ono | 1989-03-28 |
| 4808455 | Magnetic recording disc and process for producing the same | Toshiaki Wada, Yoshiaki Katsuyama | 1989-02-28 |
| 4794736 | Arrangement for mechanically and accurately processing a workpiece with a position detecting pattern or patterns | Shigehiro Fuwa, Naoki Fujii, Toshikazu Hatsuse, Masaru Ito, Toshiaki Wada | 1989-01-03 |