Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4321302 | Process for producing magnetic powder having high coercive force | Shinji Umeki, Kazuaki Onuki, Kazuo Takada | 1982-03-23 |
| 4255409 | Process for producing acicular goethite | Shinji Umeki | 1981-03-10 |
| 4251504 | Process for producing acicular goethite | Shinji Umeki | 1981-02-17 |