Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6752563 | Covered highway structure with means for easy and quick access to tunnel interior | — | 2004-06-22 |
| 4646564 | Method for testing gas diffusion and apparatus for same | Kimio Ogushi, Kazuhiro Yamauchi | 1987-03-03 |