Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4924267 | Process cartridge and multi-color image forming apparatus using same | Masao Yoshikawa, Takashi Saito, Otoya Kosugiyama, Atsushi Kubota, Tuyoshi Waragai +4 more | 1990-05-08 |
| 4887102 | Image forming apparatus | Masao Yoshikawa | 1989-12-12 |
| 4774543 | Image forming apparatus with plural developing devices | Masao Yoshikawa | 1988-09-27 |