Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4835070 | Magnetic recording medium and method of producing the same | Tsutomu Mitani, Kazuo Yokoyama, Taketoshi Yonezawa | 1989-05-30 |
| 4833031 | Magnetic recording medium | Tsutomu Mitani, Masaru Odagiri, Taketoshi Yonezawa | 1989-05-23 |