Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883735 | Negatively chargeable toner for use in dry electrophotography | Masao Watanabe | 1989-11-28 |
| 4840863 | Positively chargeable toner for use in dry electrophotography | Akira Otsu | 1989-06-20 |