Issued Patents 1994
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5376615 | Color-developing compositions and their use | Keizaburo Yamaguchi, Yoshimitsu Tanabe, Akihiro Yamaguchi | 1994-12-27 |
| 5324704 | Fluoran compounds, crystalline toluene adducts thereof, recording material comprising same and process for their preparation | Masakatsu Nakatsuka, Atsuo Otsuji, Masatoshi Takagi, Akihiro Yamaguchi | 1994-06-28 |
| 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, Kazuyoshi Kikkawa +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, Kazuyoshi Kikkawa, Akihiro Yamaguchi | 1994-04-12 |
| 5300661 | Process for preparation of a recording material comprising a novel crystal of a fluoran compound | Masakatsu Nakatsuka, Atsuo Otsuji, Kazuyoshi Kikkawa, Akihiro Yamaguchi | 1994-04-05 |
| 5300473 | Recording material comprising crystal of fluoran compound | Masakatsu Nakatsuka, Atsuo Otsuji, Kazuyoshi Kikkawa, 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, Kazuyoshi Kikkawa, Akihiro Yamaguchi | 1994-02-01 |
| 5281570 | Thermochromic materials | Yoshimitsu Tanabe, Kazuyoshi Kikkawa, Masakatsu Nakatsuka, Akihiro Yamaguchi | 1994-01-25 |