Issued Patents All Time
Showing 1–2 of 2 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, Kimiaki Kinoshita, Masashi Enokiya +2 more | 1986-10-07 |
| 4568766 | 4-Hydroxy-4'-isopropoxydiphenylsulfone and its use for color-developable recording material | Masakichi Yahagi, Tetsuo Igaki, Shinji Yoshinaka, Kimiaki Kinoshita, Masashi Enokiya +2 more | 1986-02-04 |