Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5794304 | Sweeping machine with dust extraction | — | 1998-08-18 |
| 5699840 | Retention system and method for preventing the efflux of substances from installations into the surroundings | Klaus Alberti, Frank Westphal, Guido Wehmeier | 1997-12-23 |
| 5367096 | Process for the preparation of 2,5-di(phenylamino)terephthalic acid and dialkyl esters thereof in high purity | Hans-Ludwig Schafer, Thomas Vollheim, Martin Schottler | 1994-11-22 |
| 4933486 | Process for the preparation of 4-halo-3-oxo-2-alkoxyaminobutyric esters | Claus-Peter Krieg, Detlev Keil | 1990-06-12 |