Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4616239 | 4-hydroxy-4'-isopropoxydiphenylsulfone and its use for color-developable recording material | Masakichi Yahagi, Tetsuo Igaki, Shinji Yoshinaka, Kosaku Morita, Kimiaki Kinoshita +2 more | 1986-10-07 |
| 4568766 | 4-Hydroxy-4'-isopropoxydiphenylsulfone and its use for color-developable recording material | Masakichi Yahagi, Tetsuo Igaki, Shinji Yoshinaka, Kosaku Morita, Kimiaki Kinoshita +2 more | 1986-02-04 |
| 4503446 | Heat-sensitive color-developing composition | Masakichi Yahagi, Kimiaki Kinoshita | 1985-03-05 |