Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4321302 | Process for producing magnetic powder having high coercive force | Shinji Umeki, Toshihiro Hamabata, Kazuo Takada | 1982-03-23 |
| 4302510 | Magnetic recording medium | Shinji Umeki, Fumio Maruta | 1981-11-24 |