Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE33782 | Valve | Yuichi Fujita, Takayuki Kaneko, Mitsuo Okada, Kazumi Shima, Hideaki Yanaru | 1991-12-31 |
| 4789132 | Valve | Yuichi Fujita, Takayuki Kaneko, Mitsuo Okada, Kazumi Shima, Hideaki Yanaru | 1988-12-06 |