Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6192542 | Sweeper conveyor overflow and leakage recycling ramp | Sherman B. Frederick, Richard Mark Pierce | 2001-02-27 |
| 4787923 | Apparatus for cleaning an air filter | Mark J. Fleigle, Robert A. Geyer | 1988-11-29 |
| 4557739 | Sweeper with precleaner and/or demister | Lloyd D. Fortman | 1985-12-10 |