Issued Patents All Time
Showing 1–20 of 20 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9995322 | Multistage piston actuator | Tomohiro Nakata, Tadayuki Yakushijin | 2018-06-12 |
| 8800958 | Slow-acting on/off valve | — | 2014-08-12 |
| 8662469 | Power assisted on/off valve | — | 2014-03-04 |
| 7823859 | Normally-closed valve having a microflow rate adjusting device | — | 2010-11-02 |
| 7137404 | Direct acting pressure reducing valve | — | 2006-11-21 |
| 6997209 | Locking device of an air-operated normally-closed valve for a gas cylinder | — | 2006-02-14 |
| 6932315 | Manual opening apparatus for a normally-closed valve | — | 2005-08-23 |
| 6805158 | Apparatus for visually checking the operational status of a stop valve, and a manual opening apparatus for a normally-closed valve | — | 2004-10-19 |
| 6357339 | Multi-stage piston actuator | — | 2002-03-19 |
| 6244563 | Automatic two-stage switching valve | — | 2001-06-12 |
| 6244562 | Multistage switching valve, two-stage switching valve, and toggle type two-stage switching valve | — | 2001-06-12 |
| 5906353 | Toggle valve | Hisao Someya | 1999-05-25 |
| 5290972 | Stylus pen | Hisao Someya, Mitsunori Hoshi, Takashi Takizawa, Ryoji Nagano | 1994-03-01 |
| 4903939 | Pneumatically-operated valve | Ryozo Ariizumi, Masakuni Kainuma, Toshikazu Aoki, Shoji Suda, Mitsunori Hoshi | 1990-02-27 |
| 4875500 | Diaphragm type of pilot operated directional control valve | Ryozo Ariizumi, Masakuni Kainuma, Shoji Suda, Toshikazu Aoki, Masao Kojima +1 more | 1989-10-24 |
| 4840347 | Pneumatically-operated valve | Ryozo Ariizumi, Masakuni Kainuma, Toshikazu Aoki, Shoji Suda, Mitsunori Hoshi | 1989-06-20 |
| 4823834 | Diaphragm type of pilot operated directional control valve | Ryozo Ariizumi, Masakuni Kainuma, Shoji Suda, Toshikazu Aoki, Masao Kojima +1 more | 1989-04-25 |
| 4765370 | Directional control valve | Ryozo Ariizumi, Masakuni Kainuma, Sohji Suda, Toshikazu Aoki, Masao Kojima | 1988-08-23 |
| 4744388 | Diaphragm type of pilot operated directional control valve | Ryozo Ariizumi, Masakuni Kainuma, Shoji Suda, Toshikazu Aoki, Masao Kojima +1 more | 1988-05-17 |
| 4712576 | Pneumatically operated valve | Ryozo Ariizumi | 1987-12-15 |