Issued Patents 2011
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8048188 | Air cleaner arrangements; serviceable filter cartridge; and, methods | Robert Widerski, Randall Allen Engelland, Thomas R. Olson, Gary R. Gillingham | 2011-11-01 |
| 7972405 | Air cleaner arrangements; serviceable filter elements; and, methods | Randall Allen Engelland, Thomas R. Olson, Gary R. Gillingham, Jim C. Rothman | 2011-07-05 |