Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5616410 | Magnetic recording medium | Hiroshi Umezaki, Yoshiaki Takeuchi | 1997-04-01 |
| 5348920 | .theta.-alumina powder, preparation thereof and magnetic recording medium | Yoshiaki Takeuchi, Hiroshi Umezaki | 1994-09-20 |