Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4424007 | Pump and filter assembly for evaporative coolers | Douglas W. Mehrens | 1984-01-03 |
| 4353846 | Filter assembly for evaporative cooler pumps | Douglas W. Mehrens | 1982-10-12 |