Issued Patents All Time
Showing 126–150 of 254 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5288843 | Polyimides, process for the preparation thereof and polyimide resin compositions | Shoji Tamai, Masahiro Ohta, Saburo Kawashima, Katsuaki Iiyama, Hideaki Oikawa +2 more | 1994-02-22 |
| 5286840 | Thermally stable polyimide and preparation process of polyimide | Hideaki Oikawa, Nobuhito Koga, Shoji Tamai | 1994-02-15 |
| 5283313 | Readily processable polyimide, preparation process of polyimide, and resin composition of polyimide | Wataru Yamashita, Shoji Tamai | 1994-02-01 |
| 5283357 | Separation method of .alpha.-l-aspartyl-l-phenylalanine methyl ester | Toshio Katoh, Chojiro Higuchi, Takeshi Oura, Masanobu Ajioka | 1994-02-01 |
| 5283222 | Recording material comprising novel crystalline fluoran and process for prepartion of the said crystalline fluoran | Masakatsu Nakatsuka, Atsuo Otsuji, Kiyoharu Hasegawa, Kazuyoshi Kikkawa | 1994-02-01 |
| 5281570 | Thermochromic materials | Kiyoharu Hasegawa, Yoshimitsu Tanabe, Kazuyoshi Kikkawa, Masakatsu Nakatsuka | 1994-01-25 |
| 5278276 | Polyimide and high-temperature adhesive of polyimide | Masahiro Ohta, Saburo Kawashima, Yoshiho Sonobe, Shoji Tamai, Hideaki Oikawa +1 more | 1994-01-11 |
| 5276133 | Favorably processable polyimide and process for preparing polyimide | Yuichi Okawa, Shoji Tamai | 1994-01-04 |
| 5274150 | Process for producing 3,5-di(.alpha.-methylbenzyl)salicyclic acid derivative, and use of polyvalent-metal-modified product thereof as color developer | Yoshimitsu Tanabe, Keizaburo Yamaguchi | 1993-12-28 |
| 5270281 | Heat-sensitive recording materials and phenol compounds | Atsuo Otsuji, Toshihiro Motoshima, Yoshimitsu Tanabe, Kiyoharu Hasegawa, Kazuyoshi Kikkawa +1 more | 1993-12-14 |
| 5268447 | Readily processable polyimide and preparation process of same | Shoji Tamai, Masahiro Ohta | 1993-12-07 |
| 5268446 | Readily processable polyimide and preparation process of same | Shoji Tamai, Masahiro Ohta | 1993-12-07 |
| 5266654 | Resin composition | Mikio Kitahara, Koichi Machida, Takayuki Kubo, Motoyuki Torikai, Koutarou Asahina +1 more | 1993-11-30 |
| 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, Kiyoharu Hasegawa | 1993-11-09 |
| 5260388 | Polyimide and process for the preparation thereof | Shoji Tamai, Wataru Yamashita, Yuichi Okawa, Yuko Ishihara, Keizaburo Yamaguchi | 1993-11-09 |
| 5252700 | Heat-resistant adhesive and method of adhesion by using adhesive | Hideaki Okikawa, Shoji Tamai, Katsuaki Iiyama, Saburo Kawashima, Tadashi Asanuma | 1993-10-12 |
| 5245049 | Crystals of fluoran compound, crystalline solvates thereof and process for their preparation | Atsuo Otsuji, Masakatsu Nakatsuka, Kiyoharu Hasegawa, Kazuyoshi Kikkawa | 1993-09-14 |
| 5235104 | Hydrazones and electrophotographic photoreceptors comprising them | Yasuyuki Yamada, Hiroyuki Akahori, Katashi Enomoto, Hisato Itoh, Tsutomu Nishizawa | 1993-08-10 |
| 5231069 | Fluoran compound, heat sensitive recording materials comprising fluoran compound | Masakatsu Nakatsuka, Atsuo Otsuji, Kiyoharu Hasegawa, Masatoshi Takagi | 1993-07-27 |
| 5231160 | Aromatic diamine compound, preparation process of same and polyimide prepared from same | Shoji Tamai, Keizaburo Yamaguchi, Yuko Ishihara, Saburo Kawashima, Hideaki Oikawa +1 more | 1993-07-27 |
| 5220038 | Fluoran compounds, crystalline toluene adducts thereof, recording material comprising same and process for their preparation | Masakatsu Nakatsuka, Atsuo Otsuji, Kiyoharu Hasegawa, Masatoshi Takagi | 1993-06-15 |
| 5210174 | Preparation process of polyimide | Shoji Tamai, Hideaki Oikawa, Masahiro Ohta | 1993-05-11 |
| 5210221 | Crystal of fluoran compound and preparation process of the crystal | Masakatsu Nakatsuka, Atsuo Otsuji, Kiyoharu Hasegawa, Kazuyoshi Kikkawa | 1993-05-11 |
| 5208209 | Fluoran compounds, process for preparation thereof and recording materials comprising said compound | Atsuo Otsuji, Masakatsu Nakatsuka, Kiyoharu Hasegawa, Masatoshi Takagi | 1993-05-04 |
| 5206438 | Aromatic diamine compounds, bismaleimide compounds, thermosetting resin forming compositions therefrom, resins therefrom, and methods for their preparation | Keizaburo Yamaguchi, Tatsuhiro Urakami, Yoshimitsu Tanabe, Midori Yamazaki, Shoji Tamai +2 more | 1993-04-27 |