Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883345 | Projection optical apparatus | Hiroshi Tanaka | 1989-11-28 |
| 4871237 | Method and apparatus for adjusting imaging performance of projection optical apparatus | Koichi Ohno | 1989-10-03 |