Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4835291 | Divinyl compounds and chromogenic recording-material prepared by using thereof | Hajime Kawai, Yoshiharu Fujino, Youji Shimizu, Kazuhiko Gendai, Katsuhiko Tsunemitsu | 1989-05-30 |
| 4808567 | Divinyl compounds and chromogenic recording-material prepared by using thereof | Hajime Kawai, Yoshiharu Fujino, Youji Shimizu, Kazuhiko Gendai, Katsuhiko Tsunemitsu | 1989-02-28 |
| 4598150 | Chromogenic 1-(3-methoxy-4-alkoxyphenyl)-2-(2'-quinolyl)ethylene compounds | Hideaki Fujisaki, Katsuhiko Tsunemitsu | 1986-07-01 |