Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868097 | Heat development dye image forming method with surface active agents | Yasuo Aotsuka, Masatoshi Kato | 1989-09-19 |
| 4830906 | Magnetic recording medium | Yasuo Nishikawa | 1989-05-16 |