Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4851596 | Process for nucleus-chlorination of aromatic hydrocarbons | Helmut Fiege, Kai Rohlk, Karlfried Wedemeyer | 1989-07-25 |
| 4827058 | Process for the removal of m-chlorotoluene from chlorotoluene mixtures | Helmut Fiege | 1989-05-02 |