Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4731217 | Method for melt spinning thermoplastic filament yarn | Siegmar Gerhartz, Siegfried Putsch | 1988-03-15 |
| 4697753 | Stepped precision winding process | Heinz Schippers, Seigmar Gerhartz | 1987-10-06 |