Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D436647 | Propeller for agitating liquids | Helmut Etschel | 2001-01-23 |
| D432621 | Propeller for agitating liquids | Helmut Etschel | 2000-10-24 |
| D431627 | Propeller for agitating liquids | Helmut Etschel | 2000-10-03 |
| 5338116 | Guide means for a submersible mixer and the like | — | 1994-08-16 |