Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4747875 | Chromogenic azaphthalide compound and a colour-forming recording composition containing the same | Hajime Kawai, Katsuhiko Tsunemitsu | 1988-05-31 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4747875 | Chromogenic azaphthalide compound and a colour-forming recording composition containing the same | Hajime Kawai, Katsuhiko Tsunemitsu | 1988-05-31 |