Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4842408 | Phase shift measuring apparatus utilizing optical meterodyne techniques | Noriyuki Nose, Yukichi Niwa, Yoshimichi Okada | 1989-06-27 |
| 4804831 | Focus detecting apparatus independent of object image contrast | Takashi Baba, Yukichi Niwa, Takako Watanabe | 1989-02-14 |