Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6129485 | Seal and process for producing such seal | Werner Grabe, Siegfried Glang, Holger Gutschmitd, Simon Bernard, Pierre Pallot | 2000-10-10 |
| 5888023 | Seal arrangement for tubular tunnel segments | Werner Grabe, Siegfried Glang, Holger Gutschmidt | 1999-03-30 |