Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880719 | Two component electrophotographic developer | Hiroshi Nakazawa, Koichi Oyamada, Shigeo Aonuma, Yoshimi Amagai, Yasuhiro Ohya | 1989-11-14 |
| 4837100 | Electrophotographic developer containing positively chargeable toner | Yasuhiro Ohya, Hiroshi Nakazawa, Koichi Oyamada | 1989-06-06 |
| 4797340 | Dry electrophotographic toner comprising graft copolymer | Koichi Tanaka, Shigeo Aonuma, Yoshimi Amagai, Takaaki Kimura | 1989-01-10 |