Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5116437 | Method for stabilization treatment of ferromagnetic metal powder | Testushi Yamamoto, Etsuo Nakagawa | 1992-05-26 |
| 5003919 | Apparatus for stabilization treatment of ferromagnetic metal powder | Tetsushi Yamamoto, Etsuo Nakagawa | 1991-04-02 |
| 4909865 | Process for producing a ferromagnetic metal powder having an oxidized coating | Etsuo Nakagawa, Tetsushi Yamamoto, Jiro I | 1990-03-20 |