Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883711 | Magnetic recording medium | Yoshihiro Shiroishi, Sadao Hishiyama, Hiroyuki Suzuki, Yoshibumi Matsuda, Kazumasa Takagi +4 more | 1989-11-28 |
| 4842917 | Magnetic recording medium and process for producing the same | Yoshihiro Shiroishi, Sadao Hishiyama, Hiroyuki Suzuki, Takaaki Shirakura, Shinya Matsuoka +5 more | 1989-06-27 |
| 4833020 | Magnetic recording medium | Yoshihiro Shiroishi, Sadao Hishiyama, Hiroyuki Suzuki, Yoshibumi Matsuda, Kazumasa Takagi +4 more | 1989-05-23 |