Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875500 | Diaphragm type of pilot operated directional control valve | Ryozo Ariizumi, Shoji Suda, Toshikazu Aoki, Takashi Ejiri, Masao Kojima +1 more | 1989-10-24 |
| 4840347 | Pneumatically-operated valve | Ryozo Ariizumi, Toshikazu Aoki, Shoji Suda, Mitsunori Hoshi, Takashi Ejiri | 1989-06-20 |
| 4823834 | Diaphragm type of pilot operated directional control valve | Ryozo Ariizumi, Shoji Suda, Toshikazu Aoki, Takashi Ejiri, Masao Kojima +1 more | 1989-04-25 |
| 4821776 | Air pilot operated directional control valve | Rozo Ariizumi | 1989-04-18 |