Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4695640 | Addition compound of fluoran compounds and ketone | Masakichi Yahagi, Tetsuo Igaki, Shinji Yoshinaka, Kimiaki Kinoshita, Morikuni Saito +1 more | 1987-09-22 |
| 4687862 | Fluoran compounds | Takeo Obitsu, Tetsuo Igaki, Kimiaki Kinoshita, Shinichi Satoh | 1987-08-18 |
| 4680598 | Chromogenic materials employing fluoran compounds | Takeo Obitsu, Tetsuo Igaki, Kimiaki Kinoshita, Shinichi Satoh | 1987-07-14 |
| 4668967 | Fluoran compound and color forming record materials using the same | Masakichi Yahagi, Takeo Obitsu, Tetsuo Igaki, Kazuyuki Horisawa, Kimiaki Kinoshita +1 more | 1987-05-26 |