Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859881 | Filter circuit | Yoshihiro Yamamoto, Tsutomu Kume, Nobuo Yamazaki, Koichi Ohya | 1989-08-22 |
| 4841461 | Filter adjustment apparatus and method | Yoshihiro Yamamoto, Tsutomu Kume, Nobuo Yamazaki, Koichi Ohya | 1989-06-20 |
| 4812773 | Filter adjustment apparatus and method | Yoshihiro Yamamoto, Tsutomu Kume, Nobuo Yamazaki, Koichi Ohya | 1989-03-14 |