Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5773044 | Apparatus for the manufacture of corrugated tubing from thermoplastic synthetic resin | Karl Werner Dietrich, Michael Hurler | 1998-06-30 |
| 5124109 | Method for producing a double wall pipe | — | 1992-06-23 |
| 4846660 | Apparatus for producing double wall pipe | — | 1989-07-11 |