Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880762 | Coloring phthalide compounds, method of producing the compounds and recording materials using any of the compounds as coloring component | Kiyotaka Iiyama | 1989-11-14 |
KH
Kunio Hayakawa
Overall (1989): #85,624 of 140,708Top 65%
1
Patents 1989