Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4452956 | Discrete spiral flow imparting device | Richard Handwerk, Hans J. Goettler | 1984-06-05 |
| 4284105 | Discrete spiral flow imparting device | Richard Handwerk, Hans J. Goettler | 1981-08-18 |