Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4241191 | Manufacture of styrene suspension polymers | Hans G. Keppler, Erhard Stahnecker | 1980-12-23 |
| 4189515 | Particulate expandable styrene polymers having short minimum molding times | Harro Voss, Rupert Schick, Erhard Stahnecker | 1980-02-19 |