Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5283615 | Image forming apparatus having a plurality of developing devices | Tomoaki Yokoyama, Tateki Oka | 1994-02-01 |
| 5122843 | Image forming apparatus having developing devices which use different size toner particles | Tomoaki Yokoyama, Tateki Oka | 1992-06-16 |
| 5038176 | Image forming apparatus having plural magnetic brush developing devices | Tomoaki Yokoyama, Taisuke Nagao | 1991-08-06 |
| 5036369 | Image forming apparatus | Tomoaki Yokoyama, Taisuke Nagao | 1991-07-30 |
| 4954843 | Electrophotographic image forming apparatus | Tateki Oka, Naoki Toyoshi | 1990-09-04 |
| 4924270 | Toner supply device for use in image forming apparatus | Mineyuki Sako, Tateki Oka, Yasuyuki Hiromoto, Tomoaki Yokoyama | 1990-05-08 |