Issued Patents All Time
Showing 1–25 of 36 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5691272 | Carboxylate and heat-sensitive recording material using same | Mansuke Matsumoto, Nobuaki Sasaki, Bunji Sawano, Kazuyoshi Kikkawa | 1997-11-25 |
| 5647896 | Color-developing agents and color-developing sheets | Takeshi Nishimura, Tomoko Kamashita, Masaru Wada, Teruyuki Nagata, Yoshimitsu Tanabe +1 more | 1997-07-15 |
| 5559247 | Carboxylate and heat-sensitive recording material using same | Mansuke Matsumoto, Nobuaki Sasaki, Bunji Sawano, Kazuyoshi Kikkawa | 1996-09-24 |
| 5525686 | Polyvalent metal salt of salicyclic acid resin and process for preparing it | Yoshimitsu Tanabe, Jotaro Kida, Masakatsu Nakatsuka, Masayuki Furuya, Takeshi Nishimura | 1996-06-11 |
| 5447901 | Color-developing compositions and their use | Keizaburo Yamaguchi, Yoshimitsu Tanabe, Akihiro Yamaguchi | 1995-09-05 |
| 5391806 | Heat-sensitive recording materials and phenol compounds | Atsuo Otsuji, Toshihiro Motoshima, Yoshimitsu Tanabe, Kazuyoshi Kikkawa, Masakatsu Nakatsuka +1 more | 1995-02-21 |
| 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 |
| 5270281 | Heat-sensitive recording materials and phenol compounds | Atsuo Otsuji, Toshihiro Motoshima, Yoshimitsu Tanabe, Kazuyoshi Kikkawa, Masakatsu Nakatsuka +1 more | 1993-12-14 |
| 5260403 | Color-developing composition, aqueous suspension of the composition, and color-developing sheet produced using the suspension and suitable for use in pressure-sensitive copying paper | Keizaburo Yamaguchi, Yoshimitsu Tanabe, Akihiro Yamaguchi | 1993-11-09 |
| 5245049 | Crystals of fluoran compound, crystalline solvates thereof and process for their preparation | Atsuo Otsuji, Masakatsu Nakatsuka, Kazuyoshi Kikkawa, Akihiro Yamaguchi | 1993-09-14 |
| 5231069 | Fluoran compound, heat sensitive recording materials comprising fluoran compound | Masakatsu Nakatsuka, Atsuo Otsuji, 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, Atsuo Otsuji, Masatoshi Takagi, Akihiro Yamaguchi | 1993-06-15 |
| 5210221 | Crystal of fluoran compound and preparation process of the crystal | Masakatsu Nakatsuka, Atsuo Otsuji, Kazuyoshi Kikkawa, Akihiro Yamaguchi | 1993-05-11 |
| 5208209 | Fluoran compounds, process for preparation thereof and recording materials comprising said compound | Atsuo Otsuji, Masakatsu Nakatsuka, Masatoshi Takagi, Akihiro Yamaguchi | 1993-05-04 |
| 5194632 | Fluoran compound, useful in heat sensitive recording materials | Masakatsu Nakatsuka, Atsuo Otsuji, Masatoshi Takagi, Akihiro Yamaguchi | 1993-03-16 |
| 5185453 | Crystal of fluoran compound | Masakatsu Nakatsuka, Atsuo Otsuji, Kazuyoshi Kikkawa, Akihiro Yamaguchi | 1993-02-09 |
| 5118756 | Reaction system modifier suitable for use in the productions of microcapsules | Makoto Asano, Yukio Tamura, Yoshihiro Oono | 1992-06-02 |
| 5087706 | Fluoran compounds, process for preparation thereof and recording materials comprising said compound | Atsuo Otsuji, Masakatsu Nakatsuka, Masatoshi Takagi, Akihiro Yamaguchi | 1992-02-11 |