Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5676317 | Method and apparatus for combined grinding of at least two materials of differing grindability | Norbert Patzelt | 1997-10-14 |
| 5110056 | Method and apparatus for reducing brittle material for subsequent grinding | Norbert Patzelt | 1992-05-05 |
| 5096131 | Material bed roller mill | Norbert Patzelt | 1992-03-17 |
| 4792393 | Spiral air sifter having air regulation | Hubert Eickholt, Otto Heinemann, Norbert Bredenholler, Ludger Kimmeyer, Peter Tiggesbaumker +2 more | 1988-12-20 |
| 4783012 | Method and apparatus for the two-stage crushing of brittle material for grinding | Norbert Patzelt, Heinz-Georg Mersmann, Franz-Josef Adrian, Hardy Kropf | 1988-11-08 |
| 4783011 | Method and apparatus for the two-stage crushing of brittle material for grinding | Norbert Patzelt, Heinz-Georg Mersmann, Franz-Josef Adrian, Hardy Kropf | 1988-11-08 |
| 4694994 | Roller mill | Heinrich Henne, Hubert Eickholt, Ludger Lohnherr | 1987-09-22 |
| 4690335 | Methods and apparatus for two-stage crushing | Tyark Allers | 1987-09-01 |