Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6068772 | Apparatus for processing fiber suspensions intended for the production of paper or cardboard | Erich Czerwoniak, Hagen Hutzler, Jochen Gustav Pfeffer | 2000-05-30 |
| 5176261 | Rotor for pressure sorters for sorting fibrous suspensions | — | 1993-01-05 |
| 4842722 | Pressure sorter | — | 1989-06-27 |
| 4632320 | Apparatus for dissolving and sorting waste paper | Hagen Hutzler | 1986-12-30 |
| 4619737 | Roller for machines in the paper-making industry | — | 1986-10-28 |
| 4571298 | Sorting screen | — | 1986-02-18 |
| 4566942 | Method of and apparatus for treating waste paper | Hagen Hutzler | 1986-01-28 |
| 4529519 | Screen cage for separators for sorting fibre suspensions | — | 1985-07-16 |
| 4465591 | Method and apparatus for treating waste paper | Hagen Hutzler | 1984-08-14 |
| 4287055 | Method of sorting fibre suspensions as well as a pressure sorter for performing the method | — | 1981-09-01 |
| 4202761 | Sorting apparatus for sorting fiber suspensions | — | 1980-05-13 |
| 4188286 | Screening apparatus for fiber suspensions | — | 1980-02-12 |