Issued Patents All Time
Showing 1–25 of 41 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7424232 | Charging apparatus | Norio Takahashi, Jun Hirabayashi | 2008-09-09 |
| 7116922 | Charging apparatus | Norio Takahashi, Jun Hirabayashi | 2006-10-03 |
| 6904253 | Charging member having an elastic foam member including cell portions whose gap ratio is 5% to 50%, charging apparatus, process cartridge, and image forming apparatus having such charging member | Takahiro Hosokawa, Yasunori Chigono, Jun Hirabayashi | 2005-06-07 |
| 6832062 | Charging apparatus, process cartridge and image forming apparatus having electroconductive particles charged in a nip between a charging member and a member to be charged | Yasunori Chigono, Jun Hirabayashi, Norio Takahashi | 2004-12-14 |
| 6788911 | Charging apparatus, process cartridge and image forming apparatus | Yasunori Chigono, Jun Hirabayashi | 2004-09-07 |
| 6615010 | Electrifier for charging developer carrying member using charge particles, including charge rotary member and nip forming member having bias polarity the same as developer polarity | Jun Hirabayashi, Yasunori Chigono | 2003-09-02 |
| 6580889 | IMAGE FORMING APPARATUS HAVING A MEMBER TO BE CHARGED, INJECTION CHARGING MEANS HAVING AN ELASTIC MEMBER FOR PRESS-CONTACTING THE MEMBER TO BE CHARGED, AND ELECTROCONDUCTIVE PARTICLES BETWEEN THE ELASTIC MEMBER AND THE MEMBER TO BE CHARGED | Yukio Nagase, Yasunori Chigono, Jun Hirabayashi | 2003-06-17 |
| 6553199 | Charging device, process cartridge and image forming apparatus | Yasunori Chigono, Jun Hirabayashi | 2003-04-22 |
| 6549742 | Charging apparatus employing charging particles, and image forming apparatus employing such a charging apparatus | Yasunori Chigono, Jun Hirabayashi, Norio Takahashi | 2003-04-15 |
| 6519433 | Image forming apparatus in which electroconductive particles are supplied to charging means from developing device by way of image bearing member | Jun Hirabayashi, Yasunori Chigono | 2003-02-11 |
| 6473582 | Contact-type charging device having a plurality of projections over the surface of the charging device | Yasunori Chigono, Jun Hirabayashi | 2002-10-29 |
| 6466758 | Developing apparatus having foreign matter accumulating space | Yasunori Chigono, Jun Hirabayashi | 2002-10-15 |
| 6442362 | Image forming apparatus for making recovery and restoration of toners by electrical conductive member | Jun Hirabayashi, Yasunori Chigono | 2002-08-27 |
| 6389254 | Charging member holding charge accelerating particles in a continuous bubble | Yasunori Chigono, Jun Hirabayashi | 2002-05-14 |
| 6301455 | Charging member, charging device and image forming apparatus wherein deposition of magnetic particles to a member to be charged is effectively prevented | Yasushi Sato, Hideyuki Yano, Tadashi Furuya, Yasunori Chigono, Seiji Mashimo | 2001-10-09 |
| 6301459 | Charging apparatus with first and second charging members | Yasushi Sato, Hideyuki Yano, Tadashi Furuya, Yasunori Chigono, Seiji Mashimo | 2001-10-09 |
| 6298205 | Charging apparatus which stores electrically conductive particles in granule form | Yasunori Chigono, Jun Hirabayashi | 2001-10-02 |
| 6289190 | Electrophotographic apparatus and process cartridge | Shoji Amamiya, Akio Maruyama, Yukio Nagase, Toshihiro Kikuchi, Koichi Suzuki | 2001-09-11 |
| 6272301 | Image forming apparatus featuring a rotatable electroconductive foam member | Masaya Kawada, Toshiyuki Ehara | 2001-08-07 |
| 6233419 | Charging device and image forming apparatus | Yasunori Chigono, Jun Hirabayashi | 2001-05-15 |
| 6226480 | Image forming apparatus supplying charging accelerating particles to image bearing body in non-image forming | Jun Hirabayashi, Yasunori Chigono | 2001-05-01 |
| 6212346 | Charging member for holding electrically conductive particles in cells | Jun Hirabayashi, Yasunori Chigono | 2001-04-03 |
| 6173144 | Image forming apparatus which supplies image bearing member with electrically conductive particles during development | Jun Hirabayashi, Yasunori Chigono, Seiichi Shinohara | 2001-01-09 |
| 6163671 | Contact charger having charging performance enhancing particles existing at a contact portion between the contact charger and the member to be charged | Yasunori Chigono, Jun Hirabayashi | 2000-12-19 |
| 6157800 | Charging device using a magnetic brush contactable to a member to be charged and image forming apparatus using same | Hideyuki Yano, Tadashi Furuya | 2000-12-05 |