Issued Patents All Time
Showing 1–25 of 36 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10884346 | Electrophotographic photosensitive member, process cartridge, and image forming apparatus | Hiroki Tsurumi | 2021-01-05 |
| 10809638 | Electrophotographic photosensitive member | Yohei Yamamoto | 2020-10-20 |
| 10761440 | Electrophotographic photosensitive member, process cartridge, and image forming apparatus | Hiroki Tsurumi, Jun Azuma | 2020-09-01 |
| 10078276 | Positively chargeable single-layer electrophotographic photosensitive member, process cartridge, and image forming apparatus | Hiroki Tsurumi | 2018-09-18 |
| 9785062 | Positively chargeable single-layer electrophotographic photosensitive member, process cartridge, and image forming apparatus | Hiroki Tsurumi | 2017-10-10 |
| 9690217 | Triarylamine derivative, electrophotographic photosensitive member, and image forming apparatus | Hideki Okada, Fumio Sugai, Kensuke Kojima, Hiroki Tsurumi, Yohei Yamamoto | 2017-06-27 |
| 9684253 | Triphenylamine derivative, electrophotographic photosensitive member, and image forming apparatus | Hideki Okada, Kensuke Kojima, Fumio Sugai, Hiroki Tsurumi, Yohei Yamamoto | 2017-06-20 |
| 9541849 | Positively chargeable single-layer electrophotographic photosensitive member and image forming apparatus | Tomofumi SHIMIZU, Hiroki Tsurumi, Yohei Yamamoto | 2017-01-10 |
| 8980507 | Positively chargeable monolayer electrophotographic photosensitive member and image forming apparatus | Tomofumi SHIMIZU, Hiroki Tsurumi | 2015-03-17 |
| 8679710 | Electrophotographic photoreceptor and image forming apparatus | Daisuke Kuboshima, Kazunari Hamasaki, Norio Nakai, Yoshio Inagaki, Hideki Okada +2 more | 2014-03-25 |
| 7555241 | Image forming device using a single-layer-type electrophotographic photoconductor and image forming method using the same | Makoto Shishido, Shiho Okawa, Yasufumi Mizuta | 2009-06-30 |
| 7057034 | Titanyl phthalocyanine crystal and production method of the same, and electrophotosensitive material | Kazunari Hamasaki, Daisuke Kuboshima, Hisakazu Honma, Jun Azuma | 2006-06-06 |
| 7029811 | Electrophotographic photoreceptor | Jun Azuma | 2006-04-18 |
| 6573017 | Single-layer type electrophotosensitive material | Jun Azuma, Yukimasa Watanabe, Hisakazu Honma, Ayako Yashima, Maki Uchida | 2003-06-03 |
| 6489071 | Electrophotosensitive material | Yoshio Inagaki, Hideaki Fukunaga | 2002-12-03 |
| 6153344 | Positive charging single-layer type electrophotosensitive material | Susumu Hiroshima | 2000-11-28 |
| 5994012 | Naphthoquinone derivative and electrophotosensitive material using same | Yukimasa Watanabe, Sakae Saito, Hirofumi Kawaguchi, Akiyoshi Urano, Fumio Sugai +7 more | 1999-11-30 |
| 5914208 | Electrophotographic photosensitive material | Toshiyuki Fukami, Nariaki Tanaka, Ichiro Yamazato, Tohru Ueno, Hiroshi Mishima | 1999-06-22 |
| 5863688 | Naphthoquinone derivative | Yukimasa Watanabe, Sakae Saito, Hirofumi Kawaguchi, Akiyoshi Urano, Fumio Sugai +7 more | 1999-01-26 |
| 5851712 | Electrophotosensitive material | Nariaki Muto, Keisuke Sumida, Hiroaki Iwasaki, Tsuneo Oki, Yasuyuki Hanatani +1 more | 1998-12-22 |
| 5843606 | Phenanthrylenediamine derivative | Mikio Kakui, Hideo Nakamori, Yukikatsu Imanaka, Yasuyuki Hanatani | 1998-12-01 |
| 5830615 | Naphthylenediamine derivative and electrophotosensitive material using the same | Mikio Kakui, Hideo Nakamori, Yukikatsu Imanaka, Tadashi Sakuma, Maki Uchida +4 more | 1998-11-03 |
| 5826153 | Image-forming machine | Hiroyuki Hazama, Hideo Nakamori, Takashi Terada, Masayuki Ishii, Takahiko Murata | 1998-10-20 |
| 5767315 | Naphthylenediamine derivative | Mikio Kakui, Hideo Nakamori, Yukikatsu Imanaka, Tadashi Sakuma, Maki Uchida | 1998-06-16 |
| 5750308 | Electrophotographic developing method using developing bias voltage based on light decay characteristics of photosensitive material | Mitsuji Tsujita, Nariaki Tanaka, Takashi Terada, Takuji Terada, Ichiro Yamazato | 1998-05-12 |