Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5766763 | Hexagonal system ferrite powder for a high density magnetic recording medium | Osamu Kubo, Tatsumi Maeda, Etsuji Ogawa | 1998-06-16 |
| 5686137 | Method of providing hexagonal ferrite magnetic powder with enhanced coercive force stability | Etsuji Ogawa, Osamu Kubo, Tatsumi Maeda | 1997-11-11 |
| 5576114 | High density magnetic recording medium containing hexagonal system ferrite powder | Osamu Kubo, Tatsumi Maeda, Etsuji Ogawa | 1996-11-19 |
| 5494749 | Magnetic powder for magnetic recording and magnetic recording medium containing the same | Osamu Kubo, Tatsumi Maeda, Tutomu Nomura, Etsuji Ogawa | 1996-02-27 |
| 5378547 | Magnetic powder for magnetic recording and magnetic recording medium containing the same | Osamu Kubo, Tatsumi Maeda, Tutomu Nomura, Etsuji Ogawa | 1995-01-03 |
| 4837092 | Magnetic recording powder, method of manufacturing thereof and application thereof | Hirotaka Yokoyama, Tadashi Ido, Tatsumi Maeda | 1989-06-06 |
| 4699771 | Magnetic recording powder, method of manufacturing thereof and application thereof | Hirotaka Yokoyama, Tadashi Ido, Tatsumi Maeda | 1987-10-13 |