Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871713 | Heat-sensitive recording material | Katsumi Matsuoka, Ken Iwakura | 1989-10-03 |
| 4839332 | Heat-sensitive recording material | Naoto Yanagihara, Ken Iwakura | 1989-06-13 |
| 4835133 | Recording material | Naoto Yanagihara, Masato Satomura, Yuichi Wakata, Ken Iwakura | 1989-05-30 |