Issued Patents All Time
Showing 1–25 of 58 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6291600 | Method of preventing scale adhesion to the surfaces of a polymerization tank | Seiichi Masuko, Ichisaburo Nakamura, Yoshimatsu Naka, Keiichi Fukuda, Akira Yamamoto +2 more | 2001-09-18 |
| 6040111 | Aromatic hydroxycarboxylic acid resins and their use | Akio Karasawa, Akihiro Yamaguchi, Yuko Ishihara | 2000-03-21 |
| 5798422 | Aromatic hydroxycarboxylic acid resins and their use | Akio Karasawa, Akihiro Yamaguchi, Yuko Ishihara | 1998-08-25 |
| 5710334 | Aromatic dinitro and diamino intermediates | Yuko Ishihara, Mitsunori Matsuo, Akihiro Yamaguchi | 1998-01-20 |
| 5674953 | Method of preventing scale adhesion to surfaces of polymerization tank with phenol-aldehyde coating | Seiichi Masuko, Ichisaburo Nakamura, Keiichi Fukuda, Yasuyuki Hatakeyama, Akihiro Yamaguchi | 1997-10-07 |
| 5631377 | Polyimide intermediates | Mitsunori Matsuo, Tsutomu Ishida, Akio Karasawa, Akihiro Yamaguchi | 1997-05-20 |
| 5494996 | Polyimide resin composition | Shoji Tamai, Yuichi Okawa, Wataru Yamashita, Yoshihiro Sakata, Hideaki Oikawa +3 more | 1996-02-27 |
| 5484880 | Polyimide | Wataru Yamashita, Yuichi Okawa, Shoji Tamai, Mitsunori Matsuo, Tsutomu Ishida +1 more | 1996-01-16 |
| 5484948 | Bismaleimide compounds | Tatsuhiro Urakami, Yoshimitsu Tanabe, Midori Yamazaki, Shoji Tamai, Norimasa Yamaya +2 more | 1996-01-16 |
| 5480965 | Readily soluble, amorphous polyimide, and preparation process of same | Wataru Yamashita, Yuichi Okawa, Hideaki Oikawa, Tadashi Asanuma, Yuko Ishihara +3 more | 1996-01-02 |
| 5470943 | Polyimide | Yoshihiro Sakata, Wataru Yamashita, Yuichi Okawa, Shoji Tamai, Tsutomu Ishida +2 more | 1995-11-28 |
| 5447901 | Color-developing compositions and their use | Yoshimitsu Tanabe, Kiyoharu Hasegawa, Akihiro Yamaguchi | 1995-09-05 |
| 5410084 | Aromatic diamine and polyimide, and preparation process of same | Mitsunori Matsuo, Tsutomu Ishida, Akihiro Yamaguchi | 1995-04-25 |
| 5376615 | Color-developing compositions and their use | Yoshimitsu Tanabe, Kiyoharu Hasegawa, Akihiro Yamaguchi | 1994-12-27 |
| 5364967 | Aromatic diamine compounds, bismalemide compounds, thermosetting resin forming compositions therefrom, resin therefrom, and methods for their preparation | Tatsuhiro Urakami, Yoshimitsu Tanabe, Midori Yamazaki, Shoji Tamai, Norimasa Yamaya +2 more | 1994-11-15 |
| 5354839 | Polyimide and preparation process of same | Wataru Yamashita, Yoshihiro Sakata, Toshiyuki Kataoka, Yuichi Okawa, Hideaki Oikawa +4 more | 1994-10-11 |
| 5354890 | Aromatic diamine intermediates useful in the preparation of polyimides | Shoji Tamai, Wataru Yamashita, Yuichi Okawa, Yuko Ishihara, Akihiro Yamaguchi | 1994-10-11 |
| 5326739 | Process for producing 3,5-di(.alpha.-methylbenzyl)salicylic acid derivative, and use of polyvalent-metal-modified product thereof as color developer | Yoshimitsu Tanabe, Akihiro Yamaguchi | 1994-07-05 |
| 5322962 | Aromatic diamine intermediates useful in the preparation of polyimide | Shoji Tamai, Yuko Ishihara, Saburo Kawashima, Hideaki Oikawa, Toshiyuki Kataoka +1 more | 1994-06-21 |
| 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, Akihiro Yamaguchi | 1993-12-28 |
| 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 | Yoshimitsu Tanabe, Kiyoharu Hasegawa, Akihiro Yamaguchi | 1993-11-09 |
| 5260388 | Polyimide and process for the preparation thereof | Shoji Tamai, Wataru Yamashita, Yuichi Okawa, Yuko Ishihara, Akihiro Yamaguchi | 1993-11-09 |
| 5231160 | Aromatic diamine compound, preparation process of same and polyimide prepared from same | Shoji Tamai, Yuko Ishihara, Saburo Kawashima, Hideaki Oikawa, Toshiyuki Kataoka +1 more | 1993-07-27 |
| 5206438 | Aromatic diamine compounds, bismaleimide compounds, thermosetting resin forming compositions therefrom, resins therefrom, and methods for their preparation | Tatsuhiro Urakami, Yoshimitsu Tanabe, Midori Yamazaki, Shoji Tamai, Norimasa Yamaya +2 more | 1993-04-27 |
| 5147948 | Method for polymerizing vinyl chloride while inhibiting adhesion to the polymerization reactor with coating from poly(hydricphenol sulfide) | Seiichi Masuko, Ichisaburo Nakamura, Keiichi Fukuda, Yasuyuki Hatakeyama, Akihiro Yamaguchi | 1992-09-15 |