Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8631848 | Apparatus and method for producing waterproof structural corrugated paperboard | Carl R. Marschke | 2014-01-21 |
| 7998300 | Apparatus and method for producing waterproof structural corrugated paperboard | Carl R. Marschke | 2011-08-16 |
| 7896999 | Method of forming open core web elements | Carl R. Marschke, David G. Flessert | 2011-03-01 |