Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4841073 | Radical anion salts of derivatives of 1,4,5,8-naphthalenetetracarboxylic acid and their use | Tillmann Hassel, Gerhard Heywang, Hans Muller, Hans G. Fitzky | 1989-06-20 |
| 4820580 | Process for the production of a composite system of a highly elastic material and a polyurethane foam layer and product formed thereby | Jurgen Faehndrich, Hans Hespe, Kirkor Sirinyan, Dieter Wecker | 1989-04-11 |
| 4798686 | Organic polymers with electrical properties | Ludwig Rottmaier, Klaus Reinking, Jurgen Kirsch, Heinz-Josef Fullmann | 1989-01-17 |