Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4677203 | Chromogenic fluoran derivatives | Masakichi Yahagi, Shoichi Horiuchi, Takahumi Toyama, Akio Kashiwagi, Teruo Suzuki +2 more | 1987-06-30 |
| 4668967 | Fluoran compound and color forming record materials using the same | Masakichi Yahagi, Takeo Obitsu, Tetsuo Igaki, Morio Nanbu, Kimiaki Kinoshita +1 more | 1987-05-26 |
| 4410708 | Chromogenic fluoran derivatives and the preparation and use thereof | Masakichi Yahagi, Shoichi Horiuchi, Takahumi Toyama, Akio Kashiwagi, Teruo Suzuki +2 more | 1983-10-18 |