Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845245 | Process for producing 3,3-bis-(4-dimethylaminophenyl)-6-dimethylaminophthalide | Hajime Kawai, Katsuhiko Tsunemitsu | 1989-07-04 |
| 4835291 | Divinyl compounds and chromogenic recording-material prepared by using thereof | Hajime Kawai, Youji Shimizu, Seiichi Nieda, Kazuhiko Gendai, Katsuhiko Tsunemitsu | 1989-05-30 |
| 4808567 | Divinyl compounds and chromogenic recording-material prepared by using thereof | Hajime Kawai, Youji Shimizu, Seiichi Nieda, Kazuhiko Gendai, Katsuhiko Tsunemitsu | 1989-02-28 |