Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4923485 | Process for separating organic constituents from waste gases of the production of aromatic intermediates | Ernst Horoldt, Richard C. Grimm, Siegbert Rittner, Wilfried Billmann | 1990-05-08 |
| 4814518 | Process for extracting nitrohydroxyaromatics from aqueous solutions | Helmut Gossel, Siegbert Rittner, Josef Rosenfelder, Bernhard Wojtech | 1989-03-21 |
| 4564712 | Process for the preparation of diphenyl ethers | Georg Schaeffer | 1986-01-14 |