Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6463657 | Valve element and method of manufacturing the same | Tetsuya Hayakawa | 2002-10-15 |
| 6213448 | Valve element and method of manufacturing the same | Tetsuya Hayakawa | 2001-04-10 |