Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7383855 | Sanitary tank vent valve | Clint M. Rogers, Jerold L. Hlad | 2008-06-10 |
| 5975131 | Tank valve and opening sensor | Terry J. Theisen | 1999-11-02 |
| 5497725 | Sight indicator | Terry J. Theisen, David M. Denning | 1996-03-12 |