Issued Patents All Time
Showing 25 most recent of 26 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10126667 | Quinone derivative and electrophotographic photosensitive member | Hideki Okada, Kensuke Kojima | 2018-11-13 |
| 9964869 | Triarylamine derivative, electrophotographic photosensitive member, and method for producing electrophotographic photosensitive member | Kensuke Okawa, Hideki Okada, Jun Azuma, Kensuke Kojima | 2018-05-08 |
| 9783493 | Quinone derivative and electrophotographic photosensitive member | Hideki Okada, Kensuke Kojima | 2017-10-10 |
| 9783491 | Quinone derivative and electrophotographic photosensitive member | Hideki Okada, Kensuke Kojima | 2017-10-10 |
| 9690217 | Triarylamine derivative, electrophotographic photosensitive member, and image forming apparatus | Hideki Okada, Kensuke Kojima, Hiroki Tsurumi, Yohei Yamamoto, Eiichi Miyamoto | 2017-06-27 |
| 9684253 | Triphenylamine derivative, electrophotographic photosensitive member, and image forming apparatus | Hideki Okada, Kensuke Kojima, Hiroki Tsurumi, Yohei Yamamoto, Eiichi Miyamoto | 2017-06-20 |
| 9581921 | Electrophotographic photosensitive member | Hideki Okada, Kensuke Kojima | 2017-02-28 |
| 9494881 | Triarylamine derivative and electrophotographic photosensitive member | Hideki Okada, Kensuke Kojima | 2016-11-15 |
| 9454091 | Hydrazone derivative of triphenylamine and electrophotographic photosensitive member | Hideki Okada, Kensuke Kojima | 2016-09-27 |
| 9447022 | Triarylamine derivative and electrophotographic photosensitive member | Hideki Okada, Kensuke Kojima | 2016-09-20 |
| 9436105 | Triarylamine derivative and electrophotographic photosensitive member | Hideki Okada, Kensuke Kojima | 2016-09-06 |
| 9376371 | Triphenylamine derivative, method for manufacturing the same, and electrophotographic photosensitive member | Kensuke Kojima, Kenji KITAGUCHI, Hideki Okada | 2016-06-28 |
| 7468230 | Wet-developing electrophotographic photoconductor and wet-developing image | Jun Azuma | 2008-12-23 |
| 6500592 | Electrophotosensitive material | — | 2002-12-31 |
| 6395439 | Naphthoquinone derivative and electrophotosensitive material using the same | Nobuko Akiba | 2002-05-28 |
| 6376142 | Electrophotosensitive material containing specific maleimide derivative | Kazunari Hamasaki | 2002-04-23 |
| 6346355 | Electrophotosensitive material | Yoshio Inagaki | 2002-02-12 |
| 6174638 | Naphthalenetetracarboxylic acid diimide derivatives and photosensitive materials for electrophotography | Kou Ishigami, Yasufumi Mizuta | 2001-01-16 |
| 6127076 | Naphthalenetetracarboxylic acid diimide derivatives and photosensitive material for electrophotography | Kou Ishigami, Yasufumi Mizuta | 2000-10-03 |
| 5994012 | Naphthoquinone derivative and electrophotosensitive material using same | Yukimasa Watanabe, Sakae Saito, Hirofumi Kawaguchi, Akiyoshi Urano, Atsushi Fujii +7 more | 1999-11-30 |
| 5977389 | Naphthoquinone derivative | Hideki Okada, Nobuko Akiba | 1999-11-02 |
| 5976742 | Naphthoquinone derivative and electrophotographic material using the naphthoquinone derivative | Nobuko Akiba, Kazunari Hamasaki | 1999-11-02 |
| 5863688 | Naphthoquinone derivative | Yukimasa Watanabe, Sakae Saito, Hirofumi Kawaguchi, Akiyoshi Urano, Atsushi Fujii +7 more | 1999-01-26 |
| 5817810 | Tryptanthrine compounds | Syunichi Matsumoto, Nobuko Akiba, Yukimasa Watanabe, Hirofumi Kawaguchi, Sakae Saitoh | 1998-10-06 |
| 5773613 | Tryptoanthrinimine derivative and electrophotosensitive material using the same | Hirofumi Kawaguchi, Nobuko Akiba, Yukimasa Watanabe, Hiroaki Iwasaki, Yasuyuki Hanatani +7 more | 1998-06-30 |