Issued Patents All Time
Showing 26–30 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7670484 | Filter cartridge construction with carbon profile | Donald Barry Huehn | 2010-03-02 |
| 7416659 | Filter apparatus with fluid bypass | — | 2008-08-26 |
| 7040860 | Uni-directional impeller, and impeller and rotor assembly | Joseph C. Carley | 2006-05-09 |
| 4693316 | Round mandrel slip joint | Paul D. Ringgenberg, Harold Kent Beck | 1987-09-15 |
| 4691779 | Hydrostatic referenced safety-circulating valve | Michael E. McMahan, Donald W. Winslow, Gary D. Zunkel | 1987-09-08 |