Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6129119 | Flexible tube for lining pipes and ducts as well as method and an apparatus for manufacturing thereof | Siegfried Schwert, Andreas Huttemann, Peter Marquardt, Wolf Rabold | 2000-10-10 |
| 6050300 | Method and an apparatus for lining a pipe or duct | Siegfried Schwert, Andreas Huttemann, Peter Marquardt, Wolf Rabold | 2000-04-18 |