Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4851292 | Plate-like barium ferrite particles suitable for use in magnetic recording and process for producing the same | Akihiko Hirayama, Norio Sugita, Masao Kiyama, Toshio Takada, Katsunori Fujimoto +1 more | 1989-07-25 |
| 4806429 | Plate-like barium ferrite particles suitable for use in magnetic recording and process for producing the same | Akihiko Hirayama, Norio Sugita, Masao Kiyama, Toshio Takada, Katsunori Fujimoto +1 more | 1989-02-21 |