Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4677203 | Chromogenic fluoran derivatives | Masakichi Yahagi, Takahumi Toyama, Akio Kashiwagi, Teruo Suzuki, Tetsuo Igaki +2 more | 1987-06-30 |
| 4410708 | Chromogenic fluoran derivatives and the preparation and use thereof | Masakichi Yahagi, Takahumi Toyama, Akio Kashiwagi, Teruo Suzuki, Tetsuo Igaki +2 more | 1983-10-18 |