Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4860063 | Method of controlling developer toner density of developing device | — | 1989-08-22 |
| 4799058 | Driving apparatus for a gas discharge display panel | Shinichi Shinada, Kenkichi Suzuki, Akihiko Kougami | 1989-01-17 |