Issued Patents 1989
Showing 1–2 of 2 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 |