Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4362802 | Powdery developing material for electrophotographic reproduction | Susumu Tanaka, Koji Nagai | 1982-12-07 |
| 4239845 | Electrophotographic copying method using two toners on magnetic brush | Susumu Tanaka, Koji Nagai | 1980-12-16 |