Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5022792 | Undergrond continuous impervious wall and method for installing same | Nobuyuki Matsui | 1991-06-11 |
| 4909674 | Underground continuous impervious wall and method for installing same | Nobuyuki Matsui | 1990-03-20 |