Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874397 | Coal gasification process | — | 1989-10-17 |
| 4866154 | Aromatic polyester from substituted hydroquinone and biphenyl dicarboxylic acid | Hans-Werner Schmidt | 1989-09-12 |
| 4839436 | Polyphenylene oxides with high molecular weight and a process for their preparation and their use | Karl-Heinrich Schneider | 1989-06-13 |
| 4835244 | Substituted aromatic polyesters | Wilhelm Brugging | 1989-05-30 |