Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4828957 | Two-color heat-sensitive recording material with 2-hydroxy-3-naphthoanilide as both coupler and color developing agent | Naoki Yonese, Tosaku Okamoto | 1989-05-09 |
| 4803193 | Heat-sensitive recording material using chromeno compound | Nobuo Kanda, Yukihiro Abe | 1989-02-07 |