Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880719 | Two component electrophotographic developer | Toshiaki Murofushi, Hiroshi Nakazawa, Koichi Oyamada, Shigeo Aonuma, Yoshimi Amagai | 1989-11-14 |
| 4837100 | Electrophotographic developer containing positively chargeable toner | Toshiaki Murofushi, Hiroshi Nakazawa, Koichi Oyamada | 1989-06-06 |