Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6540438 | Inflatable underground structure liner | Hans De Bruijn | 2003-04-01 |
| 6540439 | Junction seal between a liner of an underground structure and a penetrating pipe | Hans De Bruijn | 2003-04-01 |