Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4423114 | Magnetic powder for magnetic recording medium | Masashi Hayama, Keitaro Sakai | 1983-12-27 |
| 4420537 | Magnetic recording medium having cobalt adsorbed iron oxide layer | Masashi Hayama, Kenji Hirabayashi | 1983-12-13 |