Issued Patents All Time
Showing 1–25 of 25 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE41934 | Image forming system | Takahiro Yamazaki | 2010-11-16 |
| 7474867 | Magnetic carrier, two-component developer, development method, development device and image forming apparatus of electrophotography | Takamasa Ozeki, Takuji Yoneda | 2009-01-06 |
| 7174124 | Tandem color image forming apparatus with an image transfer belt and backup roller | Hitoshi Ishibashi, Yuuji Sawai, Takahiro Yoshikawa, Atsushi Takehara | 2007-02-06 |
| 7161712 | Apparatus for forming images with proper gamma correction | Minori Uchida | 2007-01-09 |
| 7139517 | Developing method for an image forming apparatus and developing device using the same | Shigekazu Enoki | 2006-11-21 |
| 7139512 | Charging device, process cartridge and image forming apparatus | Akiyo Namiki | 2006-11-21 |
| 6823149 | Image forming apparatus with variable speed transferring and fixing devices | Takahiro Yoshikawa, Hitoshi Ishibashi, Yuuji Sawai | 2004-11-23 |
| 6535707 | Image forming system | Takahiro Yamazaki | 2003-03-18 |
| 6226481 | Image forming apparatus with control over developing unit during an idle running of an intermediate image transfer body | Takuzi Yoneda, Kazuyuki Sugihara | 2001-05-01 |
| 6160569 | Image forming apparatus capable of changing process line speed | Kota Fujimori | 2000-12-12 |
| 6055386 | Apparatus and method for detecting developing ability of an image forming apparatus with varied LED continuous lighting time for image forming and process control modes | Shinji Kato, Kouta Fujimori | 2000-04-25 |
| 5881334 | Image forming apparatus and method for preventing wasted toner | Takako Maruta | 1999-03-09 |
| 5860038 | Apparatus and method for detecting developing ability of an image forming apparatus | Shinji Kato, Kouta Fujimori | 1999-01-12 |
| 5835825 | Color image forming device having a revolver developing unit | — | 1998-11-10 |
| 5826146 | Color image forming device which changes developing bias when switching between developer units | Hiroshi Takashima, Tomoji Ishikawa, Kazuyuki Sugihara, Shinji Kato, Katsuhiro Kosuge | 1998-10-20 |
| 5724634 | Image forming device in which developer roller speed is controlled in developer transfer to a photoconductive drum | — | 1998-03-03 |
| 5671470 | Color image forming device which changes developing bias when switching between developer units | Hiroshi Takashima, Tomoji Ishikawa, Kazuyuki Sugihara, Shinji Kato, Katsuhiro Kosuge | 1997-09-23 |
| 5424809 | Image forming method and apparatus for the same | Noboru Sawayama, Yoshihiro Mitekura, Katsuhiro Aoki, Koji Okabayashi | 1995-06-13 |
| 5384628 | Developing device for image forming equipment | Nobuo Takami, Kazuyuki Sugihara, Kazuo Nojima, Noboru Sawayama, Kaoru Yoshimatsu +2 more | 1995-01-24 |
| 5298944 | Testing image density to control toner concentration and dynamic range in a digital copier | Noboru Sawayama, Mitsuo Hasebe | 1994-03-29 |
| 5293198 | Image forming apparatus for controlling the dynamic range of an image | Noboru Sawayama, Katsuhiro Aoki | 1994-03-08 |
| 5270783 | Image forming equipment having improved toner sensing | Takashi Bisaiji, Kouji Hayashi, Noboru Sawayama, Takeyoshi Sekine, Norimitu Kikuchi +5 more | 1993-12-14 |
| 5237369 | Color image forming equipment responsive to changes in ambient conditions | Noboru Sawayama, Katsuhiro Aoki | 1993-08-17 |
| 5227842 | Electrophotographic image forming apparatus which controls developer bias based on image irregularity | Kouji Hayashi, Takashi Bisaiji, Norimitsu Kikuchi, Takeyoshi Sekine, Noboru Sawayama +4 more | 1993-07-13 |
| 4916547 | Color image forming apparatus | Akio Katsumata, Mitsuo Hasebe, Yoshihiro Mitekura, Hiroshi Hosaka, Itaru Matsuda +2 more | 1990-04-10 |