Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5762174 | Vacuum conveyor | Robert F. Risley, Paul E. Barkely | 1998-06-09 |
| 5605217 | Vacuum combiner and vacuum conveyor | Robert F. Risley, Paul E. Barkely | 1997-02-25 |
| 5311979 | Vacuum combiner | Robert F. Risley, Paul Barkley | 1994-05-17 |