Issued Patents All Time
Showing 1–22 of 22 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9298126 | Developing device and image forming apparatus including the same | Tamotsu Shimizu, Akihiro Watanabe, Chikara Ishihara, Yasuhiro Tauchi, Masashi Fujishima +3 more | 2016-03-29 |
| 9285713 | Developing device, and image forming apparatus provided with the same | Sakae Saito, Hiroaki Sakai, Yasuhiro Oishi, Masashi Fujishima, Chikara Ishihara +1 more | 2016-03-15 |
| 9213229 | Positively chargeable electrophotographic photosensitive member and image forming apparatus | Yuko Iwashita, Junichiro Otsubo, Kazuaki EZURE, Kazutaka Sugimoto | 2015-12-15 |
| 9158264 | Electrophotographic photosensitive member and image forming apparatus including electrophotographic photosensitive member | Yuko Iwashita, Kazutaka Sugimoto, Junichiro Otsubo, Kazuaki Edure | 2015-10-13 |
| 9158227 | Developing roller and developing apparatus and image forming apparatus using the same | Sakae Saito, Hiroaki Sakai, Yasuhiro Oishi, Masashi Fujishima, Chikara Ishihara +1 more | 2015-10-13 |
| 8642236 | Electro photographic photoconductor and color image forming apparatus | Kazunari Hamasaki, Yuko Iwashita | 2014-02-04 |
| 7090952 | Electrophotosensitive material | Jun Azuma, Ayako Yashima | 2006-08-15 |
| 6879794 | Image forming apparatus | Jun Azuma, Ayako Yashima, Keisuke Oba, Masashi Fujishima, Takashi Nagashima | 2005-04-12 |
| 6858368 | Electrophotographic photoreceptor and image forming device | Jun Azuma, Ayako Yashima | 2005-02-22 |
| 6593047 | Single-layer type electrophotosensitive material | Jun Azuma, Hisakazu Honma, Ayako Yashima, Maki Uchida, Kyoichi Nakamura | 2003-07-15 |
| 6573017 | Single-layer type electrophotosensitive material | Jun Azuma, Hisakazu Honma, Ayako Yashima, Maki Uchida, Eiichi Miyamoto | 2003-06-03 |
| 6528645 | Titanyl phthalocyanine crystal and production method of the same, and electrophotosensitive material and production method of the same | Kazunari Hamasaki, Hirofumi Kawaguchi, Mitsuo Ihara, Susumu Hiroshima, Daisuke Kuboshima | 2003-03-04 |
| 6461779 | Single-layer type electrophotosensitive material | Jun Azuma, Kyoichi Nakamura, Ayako Yashima, Hisakazu Honma | 2002-10-08 |
| 6391505 | Phthalocyanine crystal and its production, and electrophotosensitive material using the same | Kazunari Hamasaki | 2002-05-21 |
| 6338927 | Stilbene derivative, method of producing the same, and electrophotosensitive material using the same | Yoshio Inagaki | 2002-01-15 |
| 6177220 | Stilbene derivative and method of producing the same, and electrophotosensitive material | Hirofumi Kawaguchi | 2001-01-23 |
| 6022998 | Stilbene derivative and method for producing the same | Hirofumi Kawaguchi, Yoshio Inagaki | 2000-02-08 |
| 6015646 | Electrophotosensitive material and image forming method using the same | Hiroaki Iwasaki, Sakae Saitoh, Shyunichi Matsumoto, Maki Uchida | 2000-01-18 |
| 5994012 | Naphthoquinone derivative and electrophotosensitive material using same | Sakae Saito, Hirofumi Kawaguchi, Akiyoshi Urano, Fumio Sugai, Atsushi Fujii +7 more | 1999-11-30 |
| 5863688 | Naphthoquinone derivative | Sakae Saito, Hirofumi Kawaguchi, Akiyoshi Urano, Fumio Sugai, Atsushi Fujii +7 more | 1999-01-26 |
| 5817810 | Tryptanthrine compounds | Fumio Sugai, Syunichi Matsumoto, Nobuko Akiba, Hirofumi Kawaguchi, Sakae Saitoh | 1998-10-06 |
| 5773613 | Tryptoanthrinimine derivative and electrophotosensitive material using the same | Hirofumi Kawaguchi, Nobuko Akiba, Hiroaki Iwasaki, Yasuyuki Hanatani, Yasufumi Mizuta +7 more | 1998-06-30 |