Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861857 | Thermotropic polyesterimide from N-carboxyalkylene trimellitimide having excellent processibility, a process for their production and their use for the production of moldings, filaments, fibers and films | Hans R. Kricheldorf, Ralf Pakull, Volker Eckhardt | 1989-08-29 |
| 4835243 | Thermotropic aromatic polymers with high elongation at break, processes for their preparation and their use for the production of moulded articles, filaments, fibres and films | Volker Eckhardt, Erich Hammerschmidt, Ludwig Bottenbruch, Frank Kleiner, Heinz U. Blank | 1989-05-30 |
| 4806619 | Thermotropic aromatic polyesters having a high deflection temperature under load and excellent mechanical properties, a process for their preparation and their use for the production of moldings, filaments, fibres and films | Volker Eckhardt, Erich Hammerschmidt, Dieter Freitag | 1989-02-21 |
| 4801677 | Thermotropic aromatic polyester with high thermal stability | Volker Eckhardt, Ludwig Bottenbruch, Dieter Freitag, Ulrich Biskup | 1989-01-31 |
| 4797467 | Thermoplastic polycarbonate branched with tetra-hydroxyaryl-bis-quinoxaline | Volker Eckhardt, Dieter Freitag | 1989-01-10 |