Issued Patents All Time
Showing 26–38 of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5302571 | Crystals of fluoran compound, crystalline solvates thereof, process for their preparation and recording material comprising said crystal or said solvate | Masakatsu Nakatsuka, Kiyoharu Hasegawa, 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, Kiyoharu Hasegawa, Kazuyoshi Kikkawa, Akihiro Yamaguchi | 1994-04-05 |
| 5300473 | Recording material comprising crystal of fluoran compound | Masakatsu Nakatsuka, Kiyoharu Hasegawa, 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, Kiyoharu Hasegawa, Kazuyoshi Kikkawa, Akihiro Yamaguchi | 1994-02-01 |
| 5270281 | Heat-sensitive recording materials and phenol compounds | Toshihiro Motoshima, Yoshimitsu Tanabe, Kiyoharu Hasegawa, Kazuyoshi Kikkawa, Masakatsu Nakatsuka +1 more | 1993-12-14 |
| 5245049 | Crystals of fluoran compound, crystalline solvates thereof and process for their preparation | Masakatsu Nakatsuka, Kiyoharu Hasegawa, Kazuyoshi Kikkawa, Akihiro Yamaguchi | 1993-09-14 |
| 5231069 | Fluoran compound, heat sensitive recording materials comprising fluoran compound | Masakatsu Nakatsuka, Kiyoharu Hasegawa, Masatoshi Takagi, Akihiro Yamaguchi | 1993-07-27 |
| 5220038 | Fluoran compounds, crystalline toluene adducts thereof, recording material comprising same and process for their preparation | Masakatsu Nakatsuka, Kiyoharu Hasegawa, Masatoshi Takagi, Akihiro Yamaguchi | 1993-06-15 |
| 5210221 | Crystal of fluoran compound and preparation process of the crystal | Masakatsu Nakatsuka, Kiyoharu Hasegawa, Kazuyoshi Kikkawa, Akihiro Yamaguchi | 1993-05-11 |
| 5208209 | Fluoran compounds, process for preparation thereof and recording materials comprising said compound | Masakatsu Nakatsuka, Kiyoharu Hasegawa, Masatoshi Takagi, Akihiro Yamaguchi | 1993-05-04 |
| 5194632 | Fluoran compound, useful in heat sensitive recording materials | Masakatsu Nakatsuka, Kiyoharu Hasegawa, Masatoshi Takagi, Akihiro Yamaguchi | 1993-03-16 |
| 5185453 | Crystal of fluoran compound | Masakatsu Nakatsuka, Kiyoharu Hasegawa, Kazuyoshi Kikkawa, Akihiro Yamaguchi | 1993-02-09 |
| 5087706 | Fluoran compounds, process for preparation thereof and recording materials comprising said compound | Masakatsu Nakatsuka, Kiyoharu Hasegawa, Masatoshi Takagi, Akihiro Yamaguchi | 1992-02-11 |