Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873545 | Method of developing image on electrophotographic film | Keiichi Yamana, Shuichi Ohtsuka | 1989-10-10 |
| 4864351 | A method and apparatus for cleaning a developing electrode of an electrophotographic device | Shuichi Ohtsuka, Izumi Watanabe | 1989-09-05 |