Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5262446 | Polyolefin foams having a homogeneous cell structure | Isidoor De Grave, Klaus Hahn | 1993-11-16 |
| 5234962 | Polyolefin foams having a homogeneous cell structure | Isidoor De Grave, Klaus Hahn | 1993-08-10 |
| 5077322 | Foams based on an olefin copolymer | Isidoor De Grave, Joachim Fischer, Hermann Tatzel, Onno Graalmann, Juergen Kerth +1 more | 1991-12-31 |
| 5045256 | Expansion of shrunk foam particles of propylene polymers | Isidoor De Grave, Udo Haardt, Fritz E. Krueckau, Hermann Tatzel | 1991-09-03 |
| 4297252 | Aging-resistant fireproofing material | Arndt C. Caesar, Ludwig Zuern, Friedheim Gaertner | 1981-10-27 |