Issued Patents All Time
Showing 1–25 of 59 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6266508 | Developing apparatus including an AC voltage applying device | Shuichi Nakagawa, Hiroshi Goto | 2001-07-24 |
| 5781827 | Developing device having a bias-controlled toner discharging member | Hirokatsu Shimada | 1998-07-14 |
| 5493324 | Image forming apparatus | Hiroshi Goto | 1996-02-20 |
| 5365040 | Fixing device having a temperature control system | — | 1994-11-15 |
| 5303016 | Image fixing device for image forming apparatus including means for locally heating inner wall of fixing means at location corresponding to nip | Katsunari Oda, Akiyoshi Kamisaki, Norimasa Kubota, Teruo Narikawa | 1994-04-12 |
| 5287152 | Electric charge supplying device and system employing the same | Kazuyoshi Hara, Koji Uno, Hitoshi Saito, Yasuo Tanaka | 1994-02-15 |
| 5287146 | Contact type charging device having voltage limiter | Koji Uno, Yasuo Tanaka, Hitoshi Saito | 1994-02-15 |
| 5283615 | Image forming apparatus having a plurality of developing devices | Tomoaki Yokoyama, Kunio Toda | 1994-02-01 |
| 5262828 | Developing bias power unit for use in an image forming apparatus | Hiroshi Goto, Yasuo Tanaka, Tamotsu Sakuraba, Kazuyoshi Hara, Hitoshi Saito +1 more | 1993-11-16 |
| 5255062 | Image forming apparatus having a removal means for separating developers | Hideyuki Kanbayashi, Kenji Tabuchi | 1993-10-19 |
| 5243390 | Device for conveying developer in a developing device | Shinichi Takemoto, Hirofumi Hasegawa, Naoki Toyoshi, Hiroshi Goto, Narutaka Yoshida | 1993-09-07 |
| 5138385 | Developing device with electrically floating developing roller | Naoki Toyoshi | 1992-08-11 |
| 5134444 | Image forming apparatus | Kenji Tabuchi, Hideyuki Kanbayashi | 1992-07-28 |
| 5122843 | Image forming apparatus having developing devices which use different size toner particles | Tomoaki Yokoyama, Kunio Toda | 1992-06-16 |
| 5065233 | Color image forming apparatus | — | 1991-11-12 |
| 5063127 | Method for forming multi-color images | Tomoaki Yokoyama | 1991-11-05 |
| 5047805 | Developing device having a space for receiving and increasing pressure of toner received therein | Naoki Toyoshi, Hiroshi Goto, Hirofumi Hasegawa, Kenji Miyashita | 1991-09-10 |
| 5012285 | Developing apparatus including a partitioning arrangement for partitioning the toner accommodating tank | Naoki Toyoshi, Tomoaki Yokoyama, Hiroshi Mizuno, Hiroshi Murasaki, Akihito Ikegawa +2 more | 1991-04-30 |
| 5003917 | Developing apparatus with image quality control | Naoki Toyoshi, Hiroshi Goto | 1991-04-02 |
| 4954843 | Electrophotographic image forming apparatus | Naoki Toyoshi, Kunio Toda | 1990-09-04 |
| 4928145 | Developing apparatus having a bucket roller with movable buckets | Hiroshi Okamoto, Mineyuki Sako, Tetsuo Kyogoku, Toshikazu Suzuki | 1990-05-22 |
| 4924270 | Toner supply device for use in image forming apparatus | Mineyuki Sako, Yasuyuki Hiromoto, Tomoaki Yokoyama, Kunio Toda | 1990-05-08 |
| 4912513 | Developing apparatus with variable developing bias voltage | Naoki Toyoshi, Tomoaki Yokoyama | 1990-03-27 |
| 4835566 | Electrophotographic copying apparatus | Naoki Toyoshi, Tomoaki Yokoyama | 1989-05-30 |
| 4835569 | Electrophotographic copying machine for producing positive prints from both positive and negative originals | — | 1989-05-30 |