Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5885420 | Headbox for papermaking machine with more uniform flow | Helmut Heinzmann | 1999-03-23 |
| 5707495 | Headbox for papermaking machine with more uniform flow | Helmut Heinzmann | 1998-01-13 |
| 4721182 | Personnel safety device for an underground duct particularly a sewer pipe | Arnfried Brinkmann, Ernst F. Lehners | 1988-01-26 |