Issued Patents All Time
Showing 26–46 of 46 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5051494 | Thermosetting resin composition comprising an aromatic amine | Keizaburo Yamaguchi, Tatshuiro Urakami, Akihiro Yamaguchi, Norimasa Yamaya, Masahiro Ohta | 1991-09-24 |
| 5028581 | Odorless multi-valent metal modified products of salicyclic acid copolymers, production processes thereof, and use thereof as color-developing agents for pressure-sensitive copying paper sheets | Keizaburo Yamaguchi, Akihiro Yamaguchi | 1991-07-02 |
| 5023366 | Salicylic acid copolymers and their metal salts, production process thereof, color-developing agents comprising metal salts of the copolymers, and color-developing sheets employing the agents | Keizaburo Yamaguchi, Makoto Asano, Akihiro Yamaguchi | 1991-06-11 |
| 5013848 | Aromatic bismaleimide derivatives and process for preparing same | Yukihiro Yoshikawa, Midori Yamazaki, Keizaburo Yamaguchi, Kenichi Sugimoto, Akihiro Yamaguchi | 1991-05-07 |
| 4997874 | Aqueous suspension and preparation method thereof | Makoto Asano, Kiyoharu Hasegawa, Masatoshi Takagi, Akihiro Yamaguchi, Keizaburo Yamaguchi +1 more | 1991-03-05 |
| 4966961 | Polymaleimide from polyarylene polyamine and process for the preparation thereof | Keizaburo Yamaguchi, Tatsuhiro Urakami, Akihiro Yamaguchi | 1990-10-30 |
| 4957994 | Epoxy resins containing imido rings, production process thereof and epoxy resin compositions containing the same | Tatsuhiro Urakami, Keizaburo Yamaguchi, Akihiro Yamaguchi | 1990-09-18 |
| 4952648 | Production process of multivalent metal-modified salicylic acid/styrene resin, color-developing agent using the resin and suited for use in pressure-sensitive copying paper sheet and pressure-sensitive copying paper unit employing the agent | Keizaburo Yamaguchi, Akihiro Yamaguchi | 1990-08-28 |
| 4937318 | Aromatic amine resins | Keizaburo Yamaguchi, Tatsuhiro Urakami, Akihiro Yamaguchi, Norimasa Yamaya, Masahiro Ohta | 1990-06-26 |
| 4783521 | Linear salicylic acid copolymers and their metal salts, production process thereof, color-developing agents comprising metal-resins of the copolymers | Akihiro Yamaguchi, Keizaburo Yamaguchi, Makoto Asano, Masaru Wada | 1988-11-08 |
| 4769463 | 2,6-bis(aminophenoxy)pyridine and method of preparing the same | Keizaburo Yamaguchi, Kenichi Sugimoto, Yukihiro Yoshikawa, Akihiro Yamaguchi | 1988-09-06 |
| 4754068 | 1,3-bis(3-aminophenoxy)-5-halogenobenzenes and process for their preparation | Keizaburo Yamaguchi, Yukihiro Yoshikawa, Kenichi Sugimoto, Akihiro Yamaguchi | 1988-06-28 |
| 4751328 | Process for producing aminobenzylamines | Keizaburo Yamaguchi, Kenichi Sugimoto, Midori Yamazaki, Akihiro Yamaguchi | 1988-06-14 |
| 4724268 | Purification process of 3,3'-dinitrodiphenyl compounds | Keizaburo Yamaguchi, Kenichi Sugimoto, Teruyuki Nagata, Akihiro Yamaguchi | 1988-02-09 |
| 4701567 | Process for producing 6,6'-dihydroxy-3,3,3',3'-tetramethyl-1,1'-spirobiindane | Keizaburo Yamaguchi, Yukihiro Yoshikawa, Kenichi Sugimoto, Akihiro Yamaguchi | 1987-10-20 |
| 4692554 | Process for producing 1,3-bis(3-aminophenoxy)benzene | Keizaburo Yamaguchi, Yukihiro Yoshikawa, Kenichi Sugimoto, Akihiro Yamaguchi | 1987-09-08 |
| 4671890 | Aminobenzylamine composition | Keizaburo Yamaguchi, Kenichi Sugimoto, Midori Yamazaki, Akihiro Yamaguchi | 1987-06-09 |
| 4618714 | Process for preparation of 3,3'- or 3,4'-diaminobenzophenones | Keizaburo Yamaguchi, Kenichi Sugimoto, Saburo Kawashima, Akihiro Yamaguchi | 1986-10-21 |
| 4540818 | Process for preparation of 3,3'- or 3,4'-diaminodiphenylmethane | Keizaburo Yamaguchi, Kenichi Sugimoto, Saburo Kawashima, Akihiro Yamaguchi | 1985-09-10 |
| 4482742 | Process for preparing of 3,3'-diamino diphenylsulfones | Keizaburo Yamaguchi, Kenichi Sugimoto | 1984-11-13 |
| 4453009 | Process for producing fluorobenzophenone derivatives | Akihiro Yamaguchi, Keizaburo Yamaguchi, Kenichi Sugimoto | 1984-06-05 |