Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6296680 | Bag dump apparatus | Richard W. Ambs | 2001-10-02 |
| 5746796 | Air filtration apparatus and filter cartridge retaining means therefor | Richard W. Ambs, Howard E. Stugard, John W. Pfeiffer | 1998-05-05 |