Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6214283 | Method for treating an extruded plastic section and extrusion installation therefor | Jan Visscher, Jan Hendrik Prenger | 2001-04-10 |
| 5817270 | Method and device for manufacturing biaxially oriented tubing from thermoplastic material | Jan Hendrik Prenger, Jan Visscher | 1998-10-06 |
| 5785906 | Method and device for manufacturing biaxially oriented tubing from thermoplastic material | Jan Hendrik Prenger, Jan Visscher | 1998-07-28 |