Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6324350 | Reusable unit displaying a specific pattern and an image forming apparatus using the reusable unit when the specific pattern is displayed and rendering the specific pattern illegible when the reusable unit is exhausted | Kenzo Ito, Kenji Kobayashi, Masayuki Ikeda, Kenji Igarashi | 2001-11-27 |
| 6213600 | Ink-jet recording apparatus capable of limitedly using only genuine ink cartridge, ink cartridge usable in the same, and ink refilling member | Kenji Kobayashi, Kenzo Ito, Masayuki Ikeda, Kenji Igarashi | 2001-04-10 |