Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4409291 | Magnetic recording medium | Hiroshi Ogawa, Yasuo Tamai, Yasuyuki Yamada | 1983-10-11 |
| 4409299 | Magnetic recording medium | Chiaki Mizuno, Yasuo Tamai | 1983-10-11 |
| 4407901 | Magnetic recording medium | Hajime Miyatsuka, Yasuyuki Yamada | 1983-10-04 |