Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5346230 | Seal for a reciprocating rod | Herbert Schumacher, Werner Trauth | 1994-09-13 |
| 5092611 | Ferrofluid seal for a shaft | Ulrich Fruedenberg, Fritz Heck, Rolf Vogt | 1992-03-03 |