Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886438 | Method and apparatus of extruding a plastic pipe under control of the wall thickness of the extruded plastic pipe | Hans Overeljnder | 1989-12-12 |
| 4793788 | Apparatus of extruding a plastic pipe under control of the wall thickness of the extruded plastic pipe | Hans Overeijnder | 1988-12-27 |
| 4749531 | Method and apparatus of extruding a plastic pipe under control of the wall thickness of the extruded plastic pipe | Hans Overeijnder | 1988-06-07 |