Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8048185 | Diesel particulate filter assembly | Donald W. Baldwin, Steve M. Butsch | 2011-11-01 |
| 8029592 | Diesel particulate filter assembly | Eric J. Schramm, Philip P. Treier, Donald W. Baldwin, Timothy L. Memmer | 2011-10-04 |
| 7785384 | Pleated diesel particulate filter assembly | Eric J. Schramm, Phil P. Treier, Donald W. Baldwin | 2010-08-31 |