Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4851596 | Process for nucleus-chlorination of aromatic hydrocarbons | Franz-Josef Mais, Helmut Fiege, Kai Rohlk | 1989-07-25 |
| 4827057 | Process for preparing 1,2-dichlorobenzene | Josef Kasbauer, Helmut Fiege, Herbert Schmidt | 1989-05-02 |
| 4820871 | Process for the preparation of N,N-diaryl-ureas | Wolfram Kissener, Joachim Franke, Helmut Fiege | 1989-04-11 |