Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875079 | Toner density control for multicolor electrophotographic copier | Noboru Sawayama, Hideo Yoo | 1989-10-17 |
| 4837597 | Method and apparatus applicable to multicolor developing device for detecting image density | — | 1989-06-06 |