Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876022 | Method for preparing ferromagnetic iron oxide particles | Tatsuji Kitamoto | 1989-10-24 |
| 4859881 | Filter circuit | Yoshihiro Yamamoto, Tsutomu Kume, Fumiharu Hashimoto, Koichi Ohya | 1989-08-22 |
| 4851289 | Magnetic recording medium | Hiroshi Ogawa, Shinji Saito, Toshihiko Miura, Hiroaki Araki | 1989-07-25 |
| 4841461 | Filter adjustment apparatus and method | Yoshihiro Yamamoto, Tsutomu Kume, Fumiharu Hashimoto, Koichi Ohya | 1989-06-20 |
| 4812773 | Filter adjustment apparatus and method | Yoshihiro Yamamoto, Tsutomu Kume, Fumiharu Hashimoto, Koichi Ohya | 1989-03-14 |
| 4794933 | Ultrasonic blood stream observing apparatus | — | 1989-01-03 |