Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889908 | Polyethers and their use as mold release agents for plastics | Wilhelm Goyert, Helmut Kipphardt | 1989-12-26 |
| 4820871 | Process for the preparation of N,N-diaryl-ureas | Wolfram Kissener, Helmut Fiege, Karlfried Wedemeyer | 1989-04-11 |