Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8133048 | Method and blank for producing a screw-tube conveyor and screw-tube conveyor produced in this way | Frank Woelfle | 2012-03-13 |
| 6035546 | Device for heat-treating bulk materials in feed screws and bulk material drying method | Martin Siebert, Klaus Stricker | 2000-03-14 |
| 5993052 | Device for the relaxation of bulk articles containing drawn thermoplastics and for the selective softening of thermoplastics in a mixture flow for recycling | Martin Siebert, Klaus Stricker | 1999-11-30 |
| 5590789 | Process and devices for sorting thermoplastic components from a mixed stream | Martin Siebert | 1997-01-07 |
| 5549250 | Process and device for sorting thermoplastic materials from a mixed flow | — | 1996-08-27 |
| 5513807 | Method of and apparatus for collecting and treating refuse containing stretched plastics | — | 1996-05-07 |