Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4624689 | Pneumatic shock wave generator for cleaning filter cartridges | Michael Volk, David A. Metzger, Donald H. Ostby | 1986-11-25 |
| 4445912 | Effluent air filtration apparatus | Michael Volk, David A. Metzger, Donald H. Ostby | 1984-05-01 |