Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5652745 | Optical system using polarized light with prevention of effect of birefringence | Tsuyoshi Ishikawa | 1997-07-29 |
| 5629799 | Chromatic aberration correcting element and its application | Koichi Maruyama, Masahiro Oono, Satoru Tachihara, Tsuyoshi Ishikawa | 1997-05-13 |