Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7111818 | Safety valve | Masaru Takeda, Akira Oi, Shinji Maekawa, Kazuyuki Miyata, Mari Shiotsuki | 2006-09-26 |
| 6626204 | Cylinder valve assembly with check valve | Akira Oi, Mari Shiotsuki | 2003-09-30 |
| 6293307 | Valve assembly with check valve for gas cylinder | Akira Oi, Mari Shiotsuki | 2001-09-25 |