Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887131 | Developing apparatus using magnetic particles and toner particles | Hatsuo Tajima, Norihisa Hoshika, Hiroshi Tajika, Atsushi Hosoi | 1989-12-12 |
| 4873551 | Developing apparatus using magnetic carrier under AC field | Hatsuo Tajima, Atsushi Hosoi, Norihisa Hoshika, Hiroshi Tajika | 1989-10-10 |