Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5380887 | Diphenylsulfone derivatives and heat sensitive recording materials | Takafumi Tohyama, Takehiro Sato, Masaaki Uchikawa, Nobuyuki Hirai | 1995-01-10 |
| 5340788 | Diphenylsulfone derivatives and heat sensitive recording materials | Takafumi Tohyama, Takehiro Sato, Masaaki Uchikawa, Nobuyuki Hirai | 1994-08-23 |
| 4665199 | 3-N-isobutylethylamino-6-methyl-7-phenylaminofluoran | Masakichi Yahagi, Tetsuo Igaki, Sinzi Yoshinaka, Morikuni Saito, Kimiaki Kinoshita | 1987-05-12 |
| 4642357 | Chromogenic recording materials | Masakichi Yahagi, Tetsuo Igaki, Sinzi Yosinaka, Morikuni Saito, Kimiaki Kinoshita | 1987-02-10 |
| 4613879 | Chromogenic recording materials | Masakichi Yahagi, Tetsuo Igaki, Sinzi Yoshinaka, Morikuni Saito, Kimiaki Kinoshita | 1986-09-23 |
| 4590498 | Chromogenic recording materials | Masakichi Yahagi, Tetsuo Igaki, Sinzi Yosinaka, Morikuni Saito, Kimiaki Kinoshita | 1986-05-20 |