Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6581848 | Sleeper frame for a rail system for rail-mounted vehicles, especially for a ballasted track | — | 2003-06-24 |
| 5439629 | Method and apparatus for producing prefabricated components from pretensioned prestressed concrete | Joachim Heintz, Peter Auer, Helmut Lieske | 1995-08-08 |
| 5135164 | Prestressed concrete railroad tie | Peter Auer, Josef Eisermann, Helmut Lieske, Gunther Leykauf | 1992-08-04 |
| 4433944 | Structural components for constructing a wall | Karl Schm/o/ ller, Gerd Dresp | 1984-02-28 |