Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5321432 | Image forming apparatus with resolution control | Yasushi Ishikawa | 1994-06-14 |
| 5072690 | Developing device of electrophotographic printer | Yasushi Ishikawa, Tetsuya Fujita | 1991-12-17 |