Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9222358 | Sealing arrangement for shaft and tunnel constructions | Heiko Hoeft, Andreas Diener, Andreas Artus, Marc Fischer, Matthias Klug | 2015-12-29 |
| 6592296 | Sealing assembly for tunnel construction sections | Heiko Hoft, Dieter Kassel | 2003-07-15 |
| 6575664 | Sealing arrangement | Dieter Kassel, Werner Degel | 2003-06-10 |
| 6434904 | Sealing device | Dieter Kassel | 2002-08-20 |
| 5888023 | Seal arrangement for tubular tunnel segments | Werner Grabe, Siegfried Glang, Bruno Haye | 1999-03-30 |
| 5648036 | Device and process for producing the corners of sealing frames | Siegfried Glang, Werner Grabe, Jurgen Ludemann | 1997-07-15 |