Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9423753 | Image forming apparatus | — | 2016-08-23 |
| 9158258 | Image formation apparatus | Yoichi Hayakawa | 2015-10-13 |
| 9137409 | Electronic apparatus and image forming apparatus | Yoichi Hayakawa | 2015-09-15 |
| 8971733 | Image forming unit and image forming apparatus | Yoichi Hayakawa | 2015-03-03 |
| 8817294 | Image forming apparatus | Yoichi Hayakawa | 2014-08-26 |
| 8351802 | Image forming apparatus having a replaceable part | Yoichi Hayakawa | 2013-01-08 |
| 7946776 | Medium feed control method for preventing overlap-feed of recording media | — | 2011-05-24 |