Issued Patents 2004
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6676721 | Multistage air cleaner including pulse cleaning system | Gary R. Gillingham, Stan M. Koehler, William J. Krisko, Winston E. Olson, Fred H. Wahlquist +2 more | 2004-01-13 |