Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4695640 | Addition compound of fluoran compounds and ketone | Masakichi Yahagi, Tetsuo Igaki, Shinji Yoshinaka, Kimiaki Kinoshita, Toshiyuki Yamashita +1 more | 1987-09-22 |
| 4665199 | 3-N-isobutylethylamino-6-methyl-7-phenylaminofluoran | Masakichi Yahagi, Tetsuo Igaki, Sinzi Yoshinaka, Kousaku Morita, Kimiaki Kinoshita | 1987-05-12 |
| 4642357 | Chromogenic recording materials | Masakichi Yahagi, Tetsuo Igaki, Sinzi Yosinaka, Kousaku Morita, Kimiaki Kinoshita | 1987-02-10 |
| 4613879 | Chromogenic recording materials | Masakichi Yahagi, Tetsuo Igaki, Sinzi Yoshinaka, Kousaku Morita, Kimiaki Kinoshita | 1986-09-23 |
| 4590498 | Chromogenic recording materials | Masakichi Yahagi, Tetsuo Igaki, Sinzi Yosinaka, Kousaku Morita, Kimiaki Kinoshita | 1986-05-20 |