Issued Patents 1994
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5306688 | Salicylic acid derivatives, the process for preparing the same and the heat-sensitive recording materials comprising thereof | Yoshimitsu Tanabe, Yuki Kobayashi, Atsuo Otsuji, Masakatsu Nakatsuka, Kiyoharu Hasegawa +3 more | 1994-04-26 |
| 5302571 | Crystals of fluoran compound, crystalline solvates thereof, process for their preparation and recording material comprising said crystal or said solvate | Atsuo Otsuji, Masakatsu Nakatsuka, Kiyoharu Hasegawa, Akihiro Yamaguchi | 1994-04-12 |
| 5300473 | Recording material comprising crystal of fluoran compound | Masakatsu Nakatsuka, Atsuo Otsuji, Kiyoharu Hasegawa, Akihiro Yamaguchi | 1994-04-05 |
| 5300661 | Process for preparation of a recording material comprising a novel crystal of a fluoran compound | Masakatsu Nakatsuka, Atsuo Otsuji, Kiyoharu Hasegawa, Akihiro Yamaguchi | 1994-04-05 |
| 5283222 | Recording material comprising novel crystalline fluoran and process for prepartion of the said crystalline fluoran | Masakatsu Nakatsuka, Atsuo Otsuji, Kiyoharu Hasegawa, Akihiro Yamaguchi | 1994-02-01 |
| 5281570 | Thermochromic materials | Kiyoharu Hasegawa, Yoshimitsu Tanabe, Masakatsu Nakatsuka, Akihiro Yamaguchi | 1994-01-25 |